Am I wrong to never speak to my sister again?

Question

Okay I know it’s a lot of text but I just need to know I’m not in the wrong and I need someone other then me to read this. Back story this is mine and my sisters text. Kim is my best friend and Michael is my fiancé and the father of my child. I am 16 weeks pregnant. My sister also has a mental illness so I am trying to be nice but I have had enough. My mom keeps telling me that  the one who made mistakes and she is just mad so I shouldn’t be upset. Am I wrong to never speak to her again?

Edit: I want to clear some stuff up. I’m not staying in my sisters house I’m staying in my fathers house. My sister was asked if she would move the stuff out of one of the three rooms she was using so that me and my fiancé could use one because she was not living here at the time. She said no that we can just stay in her daughters room and use the bunk beds. I told her in the beginning that I will buy her a new mattress to the bed when she is ready to move the beds out because I don’t think it’s fair that I’m sleeping on the bed and not to get her at least a new mattress. 
Also my fiancé is not dirty lol I have no idea where she got that from she wasn’t even staying here when she said that. He showers everyday. I mean he smells when he gets home from work but that is because he does labor work.

Answer

I don’t care if she has a mental illness and I don’t care if she is your blood. 
Cut her out. 
Me and my brother don’t speak because of our own issues. 
Just cause there blood don’t mean they can disrespect and get away with it. They can be cut out too.

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I’ll be honest I stopped reading after she said I hope your baby dies. I don’t think I would ever be able to forgive or speak to someone who said that to me honestly. I can put up with a lot of shit but wishing death on any of my children, nope, no fucking way. I don’t care what you or your fiancé did to her or how much she hates him or what illnesses she may have that’s just something you can’t come back from. I’m shocked anyone would say that.

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After the comment about wishing death to you and your child, I would definitely cut off all ties. My mom made a comment like that and I’ve never felt more happy having cut her out of my life.

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The first few texts from her didn’t bother me much. In fact, if I’m going to play devils advocate, I’d say that maybe she felt disrespected because you didn’t respect the living situation. She clearly feels that you guys don’t take care of the belongings of hers that you’re using. She feels your boyfriend specifically is dirty and gross. So initially, I could understand that if it were true, and you’re living under her roof and using her stuff, then you guys should be cleaning up after yourself and taking care of things. Sometimes it’s hard for people to realize just how dirty they can be when it isn’t their own personal space, but instead someone else’s. 
However, when she turned nasty and wished all those horrible vial things in your baby and when she called you names like that...that is completely volatile and uncalled for. I’m very shocked anyone would actually say those things. Mental illness or not, it isn’t an excuse for your sister.
And I’m extremely proud of how calming and maturely you handled it. If I were you, I’d stop talking to her. My older sister and I have our own problems too, and she can become super nasty toward me and my family. And she doesn’t even seem to care. I go months, if almost a year, without talking to my sister. The strain in the relationship sucks, and i love my sister still. But I have to take care of myself and I’ve realized how my own well being and mental health and safety is at risk around my sister. So I keep my distance. It’s very sad our relationship has come to this. And things have become super generic and cordial between us. I hate it. But it’s not healthy to surround yourself with people who treat you this way.
Sorry this comment is so long, but one more thing...I had a best friend from age 12-22 (10 years), and she was bipolar and manic. I endured a lot being her friend and trying to stick by her side. But in the end, she was nasty to me. Like, completely vial!! And it wasn’t serving me or feeding me in a healthy spiritual/social way. She broke me down quite honestly. So I had to say goodbye. After all those years of friendship...it felt wasted at the time, but I’m so much better off with who I have in my life now.

Answer

First and foremost, what she said about you and your son is horrible. I’m so sorry she said that to you. 
Mental illnesses can be so trying and devastating and no one chooses to have them. I have a heard the craziest things from my mom who has borderline personality among other dx. I have been called a perverted thief, my sister ‘puke spawn’, my sister in law a sperm dumpster, and the hate emails the whole extended family used to receive...so hurtful and nuts. She sees things black one day, white the next with no acknowledgement of doing so. Borderline cant be treated with a med, but she takes meds for depression and anxiety. But when mom’s doing well, she’s freaking amazing. I have loved and hated that woman all of my life, but I couldn’t just cut her out entirely. Learning about the illness(es) and making healthy boundaries for you and yours and sticking to them! has been a learning curve but so beneficial. My mom is in a different season of her life and illness, and is doing great. She works hard at it and has had a lot of trial and error through the years. She’s been my rock in this pregnancy (I’m 35 weeks) and will be there for my 3rd delivery with her. I should add, she’s also a retired L&D nurse and was absolutely phenomenal at her job. I still have people tell me about how wonderful my mom was during their deliveries. There were times when I was done. So done. But my siblings and I have been a major support system through the years and are all grateful to have her in our lives. And that doesn’t mean we all haven’t had a mom-hiatus throughout the years. Sometimes they were downright necessary. I hope the best for you and your sister and those kids you both love to the end of the world and then some.

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This is not healthy.  In all seriousness. I have a friend whose brother suffered from mental illness and it ended devastatingly for hee family.  If it taught me one thing, its to protect yourself and your babies. 
You don't have to be a bitch about it, but cut off communication and keep meetings to the absolute bare minimum (like xmas dinner if you must).
There is no need to be around someone that angry, disturbed, and potentially volatile.

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Cut her out of your life. No apology can make up for that garbage.

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Be done with her. You post about this before I said than to be done.  I mean it. Block her on everything.  She doesn’t have the right to be in your life after saying what she said. Sister or not.

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Being close with someone and never speaking to them again are on very different sides of the spectrum. I can see distancing yourself, but to say "never speak to her again" sounds a bit extreme especially if she has mental illness.

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This is very sad I would keep my distance untill she apologize.