mothers in law...

Sydney • Advice, friendships, baby dust, & more✨
Long story short about a month ago there was some drama with my boyfriend's brother's girlfriend. She doesn't like me because she thought her boyfriend was checking me out. She has been so rude to me and blocked me on everything. I didn't really care because his mom was on my side and thought she was being crazy, all I said was I wanted my boyfriend and his brother to stay close no matter what.
She calls about a month ago not knowing I was there and calls me a stupid ass bitch, saying I need to grow up, and she has no comment about our future together. I balled my eyes out. Right after she texted me she loved me and all this bull shit thinking I didn't hear her... I let her know I heard and she went off on me.
Fast forward a month later I'm pregnant and she is acting all excited and ready to be a grandma. I don't trust her now because I realize she was fake to me the entire relationship. I am worried about her influence in my baby's life.. she is an alcoholic and party girl. My mom doesn't trust her either and I know she's going to want to co-parent. But her and my boyfriend are very close and I don't want to come in between that. Any advice? Anyone else deal with crazy ass mothers in law?