I don't want to hear about my sister's pregnancy anymore

My sister had to go through IVF to get pregnant and she feels the need to update me on every little bit of her pregnancy and quite frankly I don't care. Me and my sister don't have much of a relationship because she did something a few years back that I deem completely unforgivable. She made my life miserable for a whole year and quite frankly I want nothing to do with her. My husband completely supported me. However my mom really wanted us to get along and got us together and basically yanked an apology out of my sister. I told them BOTH we can be civil. But we will never have a sister relationship again and there has to be boundaries. I set them. We can have a civil conversation. Even hmu here and there but we will not talk like sister's and I'm keeping my distance from her. She's crossing boundaries right now. Her successful pregnancy which I congratulated her on, doesn't change anything and I'm about to tell her to stop messaging me about it but I want to be polite about it. I kinda feel like I shouldn't have to be polite about it because she knew my boundaries and she doesn't get to come up here acting sister like just because she's pregnant. We are acquaintances now and that's all. But I want to be polite.

Edit: Okay I never said I forgave her. And it's not hate. I set boundaries. But since everyone cares so much she decided to cheat on her husband... With the man who raped me and my son for years because I wouldn't give her money. And for a year those 2 continued to harass me and she is still friends with him to this day. I have replied to her messages. I didn't start feeling some type of way until she tried to talk to me like we are sisters and tell me every little thing. While having pictures of her and that disgusting man up on her Facebook and her husband has no backbone so he would never leave her or tell her not to continue that friendship. So she's not gonna message me everyday like everything's all good and we are sisters. Also when I first confronted her about how she could do that to me she said "You deserved what you got. Maybe not your son. But you did". So .... Yeah umm fuck her. And for people saying I have hate? Not wanting to be associated with someone and hating them are 2 different things. I don't hate her anymore. I don't have the energy to care about her anymore. Just because you don't hate someone doesn't mean you're gonna be besties eating hoho's together. I don't forgive her but I have let the rage go from the situation and have set boundaries.