Beef with my MIL and Sister in Law HELP NEEDED!!!!

So basically I’d like as many opinions as possible on this because the situation is bizarre and I’m struggling to know what to do at this point.

Basically my MIL is a very toxic person, she’s very controlling, manipulative, possessive, impulsive, etc. We used to be really close and have a great relationship until recently when her emotional abuse towards my boyfriend has become clearer and for both our sakes it’s meant standing up to her more and setting boundaries - something she does NOT like.

My brother in laws girlfriend is very similar in terms of having a toxic personality, she has hit my brother in law in the face and is known for behind aggressive and having a short temper. She has been extremely unpleasant towards me, from racism to trying to compete with me. She’s also horrible to my boyfriend and tries to take his brother away from him.

For the last 2 years as I mentioned before my MIL and I were very close and had a great relationship. It sounds bad but I was always the ‘favourite’ in comparison to my brother in laws girlfriend as I have always made more of an effort with my boyfriends family and my boyfriends family (Including my MIL) knew what she was like in terms of her being very toxic so never had nice things to say about her.

However recently like I said my boyfriend and I have had to stop being so controlled by my MIL which she hasnt liked and it has lead to a huge difference in the way she treats me and in addition to this at the same time my brother in laws girlfriend has decided to have a huge problem with me. My MIL has actively made it very difficult for me and my bf to have a relationship (like trying to stop us from making plans, being annoyed at him for going to my house, invading our privacy etc) as well as individually treat me badly including being really rude and patronising to me, insulting me to my face, telling me I’ll never love him as much as her THE LIST GOES ON. But not only this, she is now also favouring by brother in law’s girlfriend over me (despite hating her about a month ago). The worst of it was when she told her I have a problem with her behind my back (basically throwing me under the bus and lying about me to stir up trouble). It now feels like they’ve hanged up together and whenever I’m in my bf’s house I feel like I’m being bullied. I know for a fact she has spoken about me behind my back, and she also does petty bitchy things like put me down in front of my brother in laws girlfriend, they exclude me from conversations on purpose, and she’ll blatantly favour my brother in law and his girlfriend by being absolutely fine with them spending time together yet whenever my bf and I spend time together she shouts and screams. Together the two of them taunt me whenever I’m in the house as well as doing and saying things behind my back. It’s getting to the point where I don’t think I can be in the house anymore. I just can’t get over the 180 she’s done on me (who has been nothing but loving to her son) whilst my brother in laws girlfriend who she said she worries about hitting him is now her favourite?

OPINIONS AND HELP NEEDED LADIES!!!