Emotional conflict?

A bit complicated.

I'm not in contact with my grandma at the moment because of an annoyance I can't easily forget.

Ever since I've known her, she's been bullying me and telling me I'm too fat, which isn't true, as I'm well within my BMI. She also slapped me once when I was little. It wasn't hard, but it traumatized me.

She also always forgets things she doesn't want to know. She bullies my mother and behaves aggressively.

She's pretty much in her own world, in my opinion.

At the same time, I love her and hope she can change. Besides, my parents think she's just the way she is and that it's a fait accompli. I feel guilty about hating her, but I can't truly love her anymore? What should I do now?