Family Law Questions? Ask a Family Lawyer Online.
I'm Lucy, and I'd be happy to answer your questions today. I'm sorry to hear about your situation.
Your boyfriend could use her behavior as grounds for requesting a full change in custody so that he is the primary custodial parent and the mother receives only supervised visitation. Custody is about who is the best person to raise a child. That means the judge is looking at things like whether a parent is fit to instill good moral values in the child - and someone who constantly puts her jealousy of you and hatred of her ex over the needs of her child is not the best person to be raising that child and teaching him what behavior is appropriate.
The judge can order her to return the child to the daycare nearby. He could also order her to move back. He can order her not contact YOU, period, for any reason, ever. He can order her not to contact the father for any reason not directly related to the child. And your boyfriend can make a list of everything she does that violates these orders and take her back from contempt. But it's possible that it would take something like losing her child and being ordered to attend counseling to really realize how wrong her behavior is.
It would help if you had witnesses to all of these things, other than the two of you. Your testimony is helpful, but if you can get any evidence from third parties that will support what you're saying, that can be very helpful in a scenario when you're dealing with a practiced liar.