I was in a very brief relationship with a woman who had moved into a shared house with as a roommate and then became a romantic partner. She became physically abusive, which I ignored.
This is the worst mistake you can possibly make. Eventually the police were called to one of those incidences and I was arrested. It is very difficult for many people to see that the man in that situation can even possibly be the victim and if you look at the Wikipedia article about domestic violence against men there is an active effort by some in the academic world to make sure that female perpetrators are never prosecuted.
I spent two years fighting felony charges and because of a remorselessly flawed justice system, I eventually pled guilty to avoid prison because I cannot prove my own innocence. In the jurisdiction where I live this is not even slightly rare.
On the night of the incident I thought I did everything right, but I now know that the only thing I could have possibly done is to pick up the phone and call the police myself. Which may still have resulted in my arrest, but my chances would have been much better.
Also, I am not blaming the woman involved. It turns out she never even lied to the police. It was simply impossible for them to see that anatomy does not make a person violent. Once charged, based on a falsified police report, it was not possible to be acquitted. So it is not really her fault at all and, again, this is not an uncommon story.
My advice to you is that, even though her physical abuse may not be too injurious, you cannot continue to accept it. If you are not willing to end the relationship and you are not willing to report her behavior, you will eventually be charged for it.