Could she be upset because he abused her.? What's her problem?

My baby's father ex is constantly talking about me and him on Facebook. She loves saying he is a bum, that I got him off of the streets when their child was an Infant, he doesn't watch none of our kids, he beat her for 4 years, put her out of the car and she said that I'm stupid for being with him after knowing she put a PPO ON HIM for domestic violence. She posted pictures of her bruised eye and leg which i did laugh about it because🗣. He never did me that way, so I don't care.🤣 Lastly she mentioned how we wont let her see their child because we want to make her look like she doesn't take care of her child. Like what the heck? Maybe HE IS, I don't care what he does because hes not doing that to me.😑smh. I already know he cheated with other women both of my pregnancies and don't keep money for rent .that's why he has me to take care of that for him. I told her it is not my fault he's treating her like this. That has nothing to do with me. 😑 What is her problem?🤔