This is not normal behavior on her part. This is domestic violence. The standard advice is to leave people who hit you. Possibly after clearly stating that you are not okay with being hit and you will leave if it continues, and giving her a chance to change her ways. Maybe she should work with a professional to help with her anger problems. But there is a significant risk that a person who regularly attacks you will escalate.
This is not normal behavior on her part. This is domestic violence. The standard advice is to leave people who hit you. Possibly after clearly stating that you are not okay with being hit and you will leave if it continues, and giving her a chance to change her ways. Maybe she should work with a professional to help with her anger problems. But there is a significant risk that a person who regularly attacks you will escalate.