She may not be screwing you any more, but she's certainly screwing with you. Don't let her get to you. Don't try to get back at her. If you get into the tit for tat thing, you'll both regret it later, so do the adult thing and move on. At least that way you come out of it with your dignity intact and you don't end up with a criminal record. I know it's slightly petty, but not getting the reaction she wants from you will probably really bug her.