Baby mama drama

Ladies I need some advice. My fiancé sons mother is driving me crazy. My fiancé takes great care of his son. He gets him every other weekend, picks him up from school and drops him off every day to her once she get off work and pays his half of the tuition. But the thing that’s annoying me, she calls constantly. She’ll call to remind him every night and then call him every morning so see if he’s coming to get his son. This man hasn’t missed a day from picking him up. He’s told her to stop but she refuse to respect our wishes. She will contact him about there son but it would be over some of the dumbest crap. Like have you seen his socks or reminding him tuition is due. When he has him for his day, she calls to ask him how his day was and to just talk to her son. And he’s getting pissed off cause he can not have one quiet private time with him without her calling. She’ll try to make small talk and he’ll hang up. She has a man and she suppose to be engaged for three yrs now. Were getting married next yr. another thing is, I know this chicks name. We spoke on the phone and she has lied to my face where I had to put her back in her place a couple of times. She has called me and introduced herself as jr mother every time she calls. Idk where she going with that but I told him to tell her when she calls my phone to address herself formally not as the mother of there son. I know who you are. I told him if she does it again I’m going to say well as the fathers son fiancé I don’t need to talk to you or you can not call my phone anymore. Is it me am I being uptight or is she doing some shade shit on the sly. I need answers