The others in your family are no longer willing to tolerate her poison. You don't deserve her poison either. Seems like she can give it out but she take a home truth or two from you? She will continue the same diatribe as long as you let her.

I had put up so much garbage from my father for years until he had run off my other siblings. So one day I snapped and told him how it was from my perspective. (It was so hard......) Surprise surprise and few days later my father apologized for the first time ever.

You never know what may happen with your mum.