Bang her in the girls bathroom or the dirtiest alley in your city, in an abandoned car, some old pissy mattresses etc. treat her like a **********, then treat her nice too. If she has a lick of sense, she will be all confused and break it off with you.
Or keep her around for saturday nights
Or make her pay you for secks....... Think of how much shit you could buy off here.
Or get her to do all the dirty things you dreamed of.
Or just be nice to her and hope it passes. Don't burn the bridge in case you wanna hit it later. But it's messed up that she wants to bone, cause *** would have been the way to get rid of her.