Distance yourself and find people to trust and care for in your life. if your mother/family wont change you could waste your life trying/waiting for change so dont do that. hard as it is there are not a lot of options. you could fight back but it could drain you and that could go on forever. distance yourself.
Stop talking to them for a while.
Did she lie and tell you you were a good speller?
old cheap jibe.
Disown them. Completely.
I had to do the same thing nearly 15 years ago. Best decision ever. Good luck.