Well you just gotta tell her (which im sure you've done by now). If she doesnt accept it, then too bad for her. Its not your problem, as you have done all you could to this point, and whether she accepts it or not is completely up to her (easier said than done, i know). If she is a total psycho, she will never accept it. If she actually has some brains (which not many people, much less women have these days), one day she will realize you were telling the truth, and realize how she was the one who ed up, and may even try to get in touch with you to apologize, who knows.
I know a situation similar to that happened to me. I really wasn't expecting the apology either, as i thought she was actually one of the total psycho crazy es. So you never know. Its almost impossible to know with women, because as i said earlier... they never know what the they want (well about 98% of them anyways. There are a few gems out there with some brains

).