Merry Christmas mother 🙄

I have a cousin coming to visit today from my mothers home country for the first time. My mother decided that she was going to help him (pay for his flight and house him). My mother thinks it’s a good idea to volunteer my fiancé to pick up my cousin from the airport. I told her that I would ask him but that we have plans to drive upstate to his family so it would most likely be a no. She calls me an hour before my cousins flight lands and says that I told her my fiancé would go pick him up so where he is? She starts calling me a liar. Saying that my fiancé dominates me and it’s pathetic. That he does whatever he wants with me. She called me “fake” and said I had no feelings towards her. I just told her Merry Christmas because she does this ALL the time. Whenever she doesn’t get what she wants, she lashes out at me and hurts my feelings on purpose. She has “disowned” me several times. Yet my 23yo brother is still living with her, not going to school and has never had a job in his life but me? I’m God awful. She doesn’t understand that I have my own life, my own shit to do. She always wants me to drop everything for her. My brother is still living home, why are you bothering me everyday? Tell HIM to do something or get tf out. All of the Christmas presents she bought for people? I ordered those. My cousins flight? I booked that. Saying that my fiancé is a bad person but I’m even worse? Crazy. She started saying to forget about her and to never call her again. Like wtf did I do to deserve this? A deadbeat father and a verbally abusive mother 🤦🏽‍♀️