I grew up with a brother who's autism is quite bad....when i started getting sick in my teenage years my mum acted like it was just some chore, something to be dealt with rather than actually caring about what was happening to me. My mother is still like this - it's like mental illness is just one big elaborate lie to her unless it fits a point she's trying to make.
When i actually got diagnosed with autism earlier last year, she was still in denial. I guess you can't get blood from a stone, i found that i could be more at peace with the situation when i realized that these are her issues and i didn't have to make them mine...it still sucks not having the kind of mum i need but i'm an adult now and have to make a choice between what i can change and what i can't. I'm really sorry you're going through this.