I knew of someone that bragged about doing this, until the guy was so fed up, he moved 2 1/2 hrs away and doesn’t visit his child; just sends the support.
This nut he was married to did everything possible to him and got by with it legally. Now she tells the child the father doesn’t care about her; when she was the one that caused him to stop visiting his daughter. If there isn’t a law on this sort of behavior, there should be.
Maybe turning the tables and hauling her into court for every inane thing might help. If the tables get turned, maybe she would wake up and smell the coffee.