My step-daughters mother...?

came over to our home, unannounced durring our visitaion. SD saw her out the window, opened up the door and said "Hi Mommy." My husband heard her say this and started to walk towards the front door. Before he got around the corner, he heard SD yell, "Daddy!" By the time he got to the door, Baby Mama was running off of property and jumped into the penger seat of an unknow vehicle with SD on her lap (no car seat or seatbelt) and they peeled out of the edition. There were skid marks left on the road. My husband called the cops, but they said there was nothing they could do b/c it was her mother. My husband called her...She picked up the phone, screamed “Take it up with the courts, B!^@#!” and hung up on him. They did go to court and the judge ordered them to take a parenting cl ($100!). She has a long history of eratic behavior, but every time we take her to court, she lies on the stand, judge believes her and we wasted another day that we could be working. What to do...??