Baby momma drama!!!

my SO's baby mom is making life hell!!! She still to this day will NOT let their child around me. Continually contact him bashing me. I've never done anything wrong to this woman but I'm starting to get annoyed! I've been civil because I understand she's the mother of his child and I don't want her pulling the "well youre not going to see your daughter anymore" card. She's already kept her from him multiple times. My SO and I share a house and it's honestly a hassle to have to leave my own home so he can spend time with his daughter because her mother is irrational... I need advice on how to get her to realize I'm eventually going to be a part of her daughter's life and I'm a good person for her daughter to be around. Shes still not over the fact that he doesn't want to be with her. It's been YEARS since they've been together.