ummmm at least bang her… if she wants to cook you shit, even better
If she starts becoming crazy and possessive (which it sounds like she will) let it continue until it outweighs the bangbang+free food
In all seriousness, she might be a decent person who did what she had to do because she had to do it and it was a means to an end. She might be the perfect girl, might be a blood sucking whore, might be a lot of things… spend time with her, don’t dwell too much on the past.
If you go out looking for the “perfect girl”, chances are that when you meet her, she will be taken… but what is more likely is that you will never find anyone because you haven’t spent enough time for them to open up. Sounds like this chick is giving it a shot at least, perhaps your constant confusion over her smokin’ hot bod and more-often-than-not erect penis is getting in the way of your brain!