shoving me with one hand on the shoulder once.

You need to draw the line and do not budge. If you forgive her this time, you'll likely be willing to forgive her the next time and so on until one day you get sick of her treating you like this and you lash out. Then suddenly she's the perfect little angel and you're the big bad monster.

Find someone who respects you and doesn't resort to violence. No one should have to stay with someone who is violent.