What are the proper steps in protecting myself since I have to counter-sue to keep myself from going to jail over a silly mix-up on her part?

My ex and I got in an altercation. It became petty so we have this thing we do when we fight. We’ll pick with each other to come out of it, pushes, butt slaps, basic playfighting. However, she, for some reason, took me mushing her playfully as aggressive and attacked me like a wild animal. In the process of protecting myself, she bumped her head on a nearby cabinet creating a small bump. She then calls the police exaggerating the story saying I mushed her out of aggression when I was just playing and was surprised by the attack.