My sister suddenly turned evil?

My sister is 34, I’m 28. We used to be very close and had a really good relationship… then she met her husband. I’m not sure was happened but she would walk around my parents house saying she “owned me”, and her husband would join in (I hadn’t met him at this point). During Covid I moved in with my sister and brother in law- I even paid rent. Out of nowhere she would start being abusive to me, screaming out of nowhere. If I didn’t the dishes, I didn’t do them right. If I vacuumed, swiffered or got a glass of water from the kitchen she would start screaming at me and running me down. Then she had a child, allowed the child to touch her husbands penis- so I told her and she was like yeah whatever. After this incident she said “you have 5 minutes to leave my house and never come back”. So I left. She has completely cut me off, my parents off, her husbands parents off- and even told people I was planning to murder her daughter )(who I loved and spoiled).

what the hell is going on?

Updates
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Yes, before anyone asks- CPS has been called on them multiple times. There’s nothing more I can do. Her husband also has 5 rape charges against him. Lost custody of his two other kids- and my sister is his third wife.
My sister suddenly turned evil?
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