1. Find the reason from yourself and see if she has any problems. Get rid of it, tell her you are not so good, and she won't be violent to you next time she sees you.
If you can't find the reason in yourself, ask her why she is always like this. If it is your own reason, then change it. If it's her fault, cooperate. If you can't cooperate, tell her what troubles this matter has caused you and tell her to stop. If she doesn't listen, you can resort to legal channels to solve it.