GET THE FUCK OUT OF HERE! I don't care how attractive she is, how popular she is, or how good the sex is, if you identify her as toxic, GET THE FUCK AWAY FROM HER! Whatever good thing makes you wonder what to do isn't worth the hell and pain you'll inevitably experience. The longer you stay, the worse it will get and the more difficult it will be to detach and get over her. I don't care what she has or might have if you have any "toxic" experiences, get the fuck out now! The time, energy, hurt, pain, humiliation, degrading, and abuse of all kinds you will endure are not worth it. Don't try to be a hero and save or help her because at the very least she will resent you.