in group settings you'll want to neutralise the threat of having someone cock-block you, so ensure that you've charmed the group and then as you presumably subtly demonstrate your value, try and isolate her whilst you physically escalate.

If you're not socially calibrated enough and don't know much about the game though... None of this will work effectively. So in that case just don't really bother to try and pick her up and instead just be ordinarily friendly and keep reading up on game, like "mystery method" "the game" and so on