Sick of my ex girlfriend?

i have posted other questions in regards to this matter. but now i have another issue. my sons dad and his girlfriend picked my son up yesterday. i told him that after today he need to provide a car seat because im sick of him taking mine. she of course had to put her 2 cents in. and said that i needed to stop my sh**. i said nothing. well today he informed me that she was bringing my son home, i told him that he had better be with her. he said he couldnt because he is at work. well thats not my problem, he is the one that wanted these days and time. and was told by the judge that our son was to be spending the time with him not his girlfriend. so when she showed up, i told her that from now on she is not welcome to my home unless he is with her. she had the nerve to tell me that she will be coming to get my son until the court order says she cant come to my house.and sped off. then a few min. ago, my mom went to the store and there was my ex his girlfriend. again he was driving ( with out a license) this bi*** had the nerve to give my mom the finger. my mother has said nothing to this girl. i did talk to a lawyer and was told that i dont have to let her pick up my son. also my mom has had it. she said that if this girl shows up again to pick the baby up. she is going to call the police and ask that they tell her not to come here. what do you think ? would i be going to far asking that she not be here unless she is with my ex. i think she is trying to make me mad enough to hit her. but i wont give her the satisfaction.