You want to cover your ass, but you also want her to shape up or ship out. Preferably both, but in this case, I'd imagine either one might work. I'm not a lawyer, so maybe this is good advice, maybe it's not so good advice. If anyone can double-check this, that'd be awesome.

First, ask her what her pay schedule is (the 1st and 15th of each month?), and roughly how much she gets paid. Then have her sign an addendum to her lease, something like....

ADDENDUM TO LEASE: Landlord will provide food for Tenant UNTIL [the date that's a day after or so her next payday, so she knows she'll be able to make it until she can buy her own] and transportation to the grocery store at Landlord's convenience thereafter. Tenant may or may not be required to pay a reasonable amount for gas in exchange for said transportation, at Landlord's sole discretion.

IN RETURN, Tenant is REQUIRED to purchase their own food and other consumable amenities (including but not limited to toiletries) and otherwise pay for their own personal expenses in perpetuity thereafter. AT NO TIME shall the Landlord be required to provide Tenant with food or other consumable amenities or fund Tenant's personal expenses after [the date previously mentioned] or prepare Tenant's food or clean up after Tenant.

Tenant HEREBY RECOGNIZES that their diet, self-care, and duty to maintain cleanliness of themselves and their environment, to the extent that they caused the mess, in a prompt and efficient manner is both required and entirely their own responsibility and NOT Landlord's responsibility in any way, shape, or form. Landlord reserves the right, at their sole discretion, to enforce reasonable standards of cleanliness.

Tenant HEREBY RECOGNIZES that ALL current and future personal expenses, whether daily necessities or otherwise, including transportation and cleaning supplies, that are not specifically outlined in the Lease, are Tenant's SOLE RESPONSIBILITY, and agrees that Landlord has no obligation whatsoever to provide these for Tenant. If Landlord DOES provide them, it is only as a courtesy, and is at Landlord's SOLE DISCRETION and may not be construed to form a continuance commitment in any way, shape, or form. Landlord reserves the right to revoke use and access to such kinds of consumable/exhaustible amenities owned by Landlord at any time, with or without cause.

Tenant HEREBY RECOGNIZES that harassment of Landlord is also prohibited, effective immediately. Tenant is also prohibited from destruction of Landlord's belongings and property. Tenant agrees to be civil with Landlord.

Tenant HEREBY RECOGNIZES that this Addendum outlines REASONABLE, COMMON-SENSE STANDARDS for adult behavior and self-sufficiency, and does not in any way, shape, or form, constitute an UNDUE BURDEN on Tenant. Tenant agrees to hold Landlord harmless from any damages, real or imagined, that result from Tenant's failure to care for and generally be responsible for themselves, including but not limited to budgeting their own finances properly. Tenant agrees to take all responsibility for their own actions and inactions, and all the consequences thereof, and behave in a manner generally accepted as socially acceptable by common definitions of the term.

IN RETURN, Landlord promises to be reasonable and fair in enforcement of these terms, and to make a good faith effort to remain civil, to the extent that Tenant is civil and behaving in accordance with the above terms, and according to the current situation/circumstances.

Tenant FURTHER RECOGNIZES that Landlord may apply, at their sole discretion, penalties for not adhering to said standards and/or not adhering to said standards in a reasonable timeframe, which may consist of fines up to $X per incident or expenses incurred plus $X, payable immediately, AND/OR termination of the Lease and immediate eviction after X willful infractions, at Landlord's sole discretion and without penalty to Landlord. Landlord reserves the right to mitigate their own damages in all circumstances and situations that may arise.

...And then spaces for each of you to sign and date.

And then not feed her ANY of your food until she signs it.

I know that contracts must have consideration, or benefit to both parties, not just obligations with consequences for only one of the two parties, while benefiting the other... hence making the "free food for now" part of it. HOWEVER, this doesn't state what the free food must be, or how much. Keep serving her rice and beans or instant ramen, if you want, just so she won't starve. And it stipulates that you'll be reasonable yourself, and not harass her, if she doesn't start shit first. (Which is just common sense anyway, right?)

This would cover a few bases:

1. She's explicitly responsible for her own damn food. AND for preparing it. (Even if that means microwaving TV dinners.)

2. She's responsible for her own damn toiletries (she cannot run you out of toilet paper... or shampoo, for example, not that it sounds likely that she'd have done so on her own before! Or at least, it's on her to get more, if she does. Because you don't have to provide it, if you don't want to.)

3. She can't even say she expects free paper towels or cleaning supplies. Bitch wants to use them, she can buy her own if you're not feeling generous that day.

4. She has to shower! Note that the middle bit specifically mentions self care and self-cleanliness in a prompt manner. You can even FINE her for not showering for a week, if she reeks.

5. She even has to do her own damn dishes! And not leave the kitchen/bathroom/living room a wreck, if she messed it up!

6. Sure, you'll have to take her to the grocery store... at your convenience. And you can even make her pitch in for gas, if you take her. And if you don't take her, she has to find her own damn ride!

7. She's not allowed to make your life hell or wreck your shit in retribution. She has to be civil.

8. If she DOES wreck your shit, you can make her pay for the items right then and there.

9. She can't even claim she's entitled to anything consumable, just because you gave her some before. If you're in a good mood and want to share your leftovers/that cake you brought home that's too much for you to eat yourself, you can totally do that, and she'll have no expectation that it isn't a one-off thing. You're not on the hook to keep providing it.

Perhaps the best aspects, imho: 10. She agrees that all of this constitutes REASONABLE STANDARDS FOR ADULT BEHAVIOR, and

1. If she doesn't behave like a reasonable adult, you can fine her... and/or evict her, when she exhausts all her chances by trying your patience!

2. The only thing you really owe her is a "good faith" effort to be civil (if SHE is!) and fair. Like you already are.

There's a reason for the word "willful" at the end of it: Because a judge probably wouldn't hold that leaving a couple dishes in the sink overnight (even for two or three days straight) is grounds for eviction, even if it happens ten times. (Or that you're being reasonable in saying she's racked up $50 in fines, by leaving a used mug out on the coffee table, so be careful with your fines.) People can be forgetful, space things out, lose track of the time, etc. Accidents happen! ....However, if she loses her mind and decides to take her frustrations over her inability to budget out on you by breaking your dishes, throwing them on the floor and all, count each dish, and you can kick her out without penalty. (Well, you can evict her. Immediately kicking her to the curb wouldn't be in the cards.) And the bit about mitigating your own damages? If she does start smashing your dishes, you can take the dishes away. If she starts abusing anything, you can take it away.

I don't expect her to rise to Crazypants level, since it seems from your comments that her problem is just general laziness and entitlement and irresponsibility, and mostly a lack of sensible budgeting... but CYA. You never know... you know?

Bonus: as it's an addendum to the lease, its terms will survive not only the length of the lease, but should also extend into the month-to-month version, if the lease converts to one after. Because who knows, maybe she will grow a brain and turn into a tenant you don't mind having around? Maybe I'm just being optimistic, but whatever. :)

(If any lawyers are reading this, please let me know how my attempt at drafting this would fly in a court. I'm honestly very curious. And hopeful; I don't think I phrased anything so that it'd be completely unreasonable, seeing as how this is basically a roommate-type behavior agreement that boils down to "self-sufficiency and common-sense responsibility, el Duderino!" but one that makes it clear that one party has recourse if the other breaks it?)