So I've never had a decent relationship with my mother but I live with her currently and I don't…

So I've never had a decent relationship with my mother but I live with her currently and I don't really want my child around her a lot. I will be moving into a place with my SO in May so I kind of have to just tough it out for now. She is a toxic person and doesn't realize it. There's no talking to her or changing her ways, but she means well. She doesn't want to purposely hurt someone but she does, emotionally or mentally. She isn't a bad person, she just is very self centered and inconsiderate. My SO has made it clear that he doesn't want her in the babies life and I don't really either. But I feel bad for "cutting her off" because she's not even gonna know why because that's how obviously she is. I don't want to cut her out completely but definitely limit contact. Help?