The thing is, that kind of behavior, by the book, isn't tolerated and can have serious consequences if reported. However, it's one of those situations where it's not really a big deal unless it's reported. If that makes sense. I don't know the girl's state of mind, she might be a bit out there and was maybe intoxicated, but you probably appeared insecure and victim-like to her and she saw that she could make you uncomfortable. Whatever, though. You shouldn't feel uncomfortable at work and if you don't want to deal with it personally, you can do what you did.