Am I (26F) overreacting into wanting to cut my in-law family off over this?

This is going to be a really long post so I apologize but if you love drama then this is the perfect post for you! lol

I (26F) met my husband (27M) last July. By September, I was pregnant. His brother (29M) and his wife (26F) had been struggling to get pregnant for years so we knew sharing this with them was going to be tough and we wanted to be sensitive. My husband decided to handle that conversation on his own (I was in the middle of moving from out of state) and told them ahead of us sharing with the rest of the family. When he shared the news to them, SIL (i will call her Bella) got visibly upset and didn't say a word. We were hoping that it would take some time for her to digest but that things would get better. That was end of September.

I came to visit in October. I was getting ready to move in November so I flew back in October to get things done and spend time with my then boyfriend (now hubby) and his family and then eventually go see mine. My hubby had said Bella was normal with him so I imagined things would be okay once I got there but it was the total opposite. I walked in the house and she started slamming doors and making it very clear my presence was not welcome. Her birthday happened to be that same week and earlier that month my MIL mentioned we were all doing something for Bellas bday. That day, MIL mentioned to me that Bella has uninvited me from birthday because my presence makes her uncomfortable. (this was before MIL knew i was preg.)

I could go into more and more details but basically it only got worse with Bella. She made it very clear that she was not happy for me and my hubby. She never congratulated us about baby, told me my presence makes her uncomfortable, told me i got knocked up and normal people would be "freaking out" rather than congratulating the moment, and a lot of other insane things. I don't know what infertility is like, but I thought she was going to the extremes by taking out all her anger on me. She later would ignore us at family events such as thanksgiving and Christmas. She literally would not look at me at any event.

Fast forward to February, me and hubby got engaged. Again, not a single congratulations or word from her. It's clear she has not accepted that we were having a child. Baby girl was due in May and we did not want nor have time for a wedding so we decided to get married at the courthouse then dinner with immediate family. Hubby and I mutually decided that we were not going to invite Bella to the celerbation. We were uncomfortable given how she has treated us. It did not make sense to have her at such an intimate celebration. We warned his parents and while they werent the happiest, they understood. Hubby also talked to his brother in advance and had asked him to talk to her so that maybe things could resolve and that we would invite her. He clearly did not do so. Then one night, me and hubby were watching a movie and we saw her car pulling into the driveway. (this was 4 days before the wedding/dinner). we were slighly hopeful this was her coming to apologize to make things right so that we could move on. WRONG! She walks into the door guns blazing, screaming at me saying I was the problem of all of this. I tried to explain to her that her actions and words have been hurtufl and that I have felt incredibly uncomfortable with her behavior towards us just for being pregnant. She didn't think she has done or said anything wrong, shes a classic narcissist. She then told me that our daughter wasn't worth congratulating because she was an accident. That sentence honestly sealed the deal for me, i do not want this chick anywhere near my child or part of her life. She left the house yelling "have a good life" and that was it.

She ended up calling hubbys sister (we will call her Amy). Our wedding celebration went on as planned that weekend. Awkward slightly because Bella told everyone her perspective and I never talked about it from mine to anyone. I just didn't want to gossip and Bella has been in the family longer than me so I just felt uncomfortable. Fast forward a couple months. My MIL hosted a baby shower for us. Hubby told her, Bella was not invited. His brother tried calling and begging us to let them come to bring a gift and show their support. Me, being 35 weeks pregnant at the time, about had a heart attack. I couldn't understand how they could dare show up to our event when NOT ONCE has bella congratulated us for anything, or even APOLOGIZED. I was appauled. we told them no and they didnt come.

The next day, Bella sent everyone a text in a text groupchat. Oh, I should probably mention that hubby sent a picture of our ultrasound in our family snapchat group and she immediately left the chat. So anyway, she created a new group and basically wrote a sob story about how she feels left out and how the family is so close but my actions of not including her have been hurtful. blah blah blah. The dad wrote back and Amy wrote back. Their responses disgusted me. They didn't hold her accountable at all. They just basically said time will heal and that everyones feeligns are hurt. I responded with exact quotes and acitons from her that have been incredibly hurtful and explained that these are not things i am just goign to let slip by. If she wanted to be in my familys life, she needed to show us with actions. NO ONE responded to my perspective. I was so hurt by this.

My husbands family is very nonconfrontational, nonconflict people. they do not send boundaries or discpline those that deserve it. Bella has been nothing but awful to me and NO ONE in the family has stood up for me to her. I didn't want anyone to pick sides, but just for someone to maybe talk through to her that what shes doing is wrong and hurtful. The fact that Bella called Amy after she came yelling at me in my house proves to me that clearly Amy doesnt tell her shes wrong, bc why else would she feel so comfortable in calling her? the parents havent said a peep either. My daughter is now 3 months old and if you're wondering if Bella is any different to us, we had a family wedding last weekend and she didnt look at me one time. There was a wedding we were at in june and she didnt look at me there either. Just proves she doesnt want to prove with actions that she is sorry and just said it to save face. but everyone fucking belived her. im at the point where i resent everyone in his family so much. it feels like no one supports/supported me during that awful time. she ruined my 9 months of pregnancy. its hard because i live a couple hours from my family but only 5 mintues from his. I feel lonely and abandonded here. My hubby tried to talk to his mom/dad/amy and just say hey we dont feel supported and they basically just said they dont know what to do. idk. i guess im wondering if im overreacting for not wanting to do anything with them. i dont want any of them at my house or be with my daughter. which i know its hard bc theyre her grandparents but im just really strugglign having any sort of relationship with any of them after this.

sorry for being long and i know im forgetting a million details. please be nice. im willing to hear out any opinions

TL;DR SIL has been horrible to me ever since I got pregnant and my in laws have not/will not discipline her so I don’t want to be around them anymore.