I’m sorry about what happened to you, some people are just evil.
Maybe she’s victim blaming you because she secretly feels ashamed of tolerating your dad’s abuse, and she’s projecting that onto you? I’m only speculating though. My mum has also been similarly weird about my friendships and relationships before, though it’s more along the lines of invalidation and being more concerned with guy’s feelings than mine. But, as someone else said to me in another post, your mother’s opinions on your relationships aren’t relevant.