WTF. I hope you were joking or being sarcastic.

To the OP: You have been given some excellent advice from the other posters. It seems like you are trying to understand her anger, or what caused her to reach that point where she resorted to violence. Honestly it doesn't matter, because there is never a legitimate reason for a person to put their hands on you like that. NEVER. You were defending yourself, and she is MANIPULATING the hell out of you to take responsibility for her actions. You didn't cause this. She did. You defended yourself the way that anyone would. So keep using your sense of self-preservation and get out of this relationship. Cut contact. Report her/don't report her (it's up to you), and then get some professional help if you're not seeing someone already.