maybe I'm being a bitch?

So to make things easy to understand my birth mother did/still does drugs and lost custody of me when I was 6. She has always been in and out of my life. Well anyways  she got mad at me for something little and started talking shit about my husband and told me I was nothing to her and took my dog to the shelter (in the middle of moving so he was over there) and now she is pissed off because I don't want her around. It's been a month or so since we've talked and my baby shower is coming up and my grandma called me "an ignorant bitch" and is telling everyone from my side of the family I don't want them at my baby shower because I don't want to invite my mom. Maybe I'm being rude or a bitch but I don't think I should have to invite her if I DONT want too.