That really sucks a lot. You should do what my friend (Arkantis) did to this guy who stole his bike. He went up, took off his bike chain necklace, and whipped the guy in the face. Did it again and the guy ran off like a pussy.
Heres what you do: Do not contact the bitch, she will come back crawling after you once she realizes you're not phased by her actions and that you can keep going without her.