Anger towards my dh's x-how to deal?

I may need a therapist. My dh's x gf and him have a daughter 10 yo. x gf and daughter live with his parents in a beautiful home. x doesn't work bc all her expenses are paid my his parents. They were together 9 years off and on although he never married her. We were married last year and she is furious. She has frightened me and my children. We got a restraing order. She now makes her daughter feel bad for having fun at our house (x's best friend told dh this). She fights him on everything-doesn't want him present at school meetings she has serious academic problems and a team was called in for an IEP. X wanted to have two meeing held which would prolong daughter getting the help she needs. She doesn't want him to attend recitals me and the other kids. Every day there is some new drama that she creates. I think about what she does to the daughter and it ticks me off. I have a hard time sleeping because I am worried aobut court proceedings that are coming up. Any advice?