Hi bubble - just wanted to send some prayers and hugs for you and your mom. Other people don't realize all the different ways alcohol can affect the body and brain. I'm just sorry they treated you and your mom that way - I'll bet, though, that you made one or two of them think...... and that's a good thing.
This is a difficult time..... but it sounds like you're doing the right thing, especially if she's still drinking. (Has she been tested for liver disease/encepalopathy?) I hope that with people who know how to deal with dementia, she can still have some positive experiences that make her life worthwhile.
On another level, she would be very proud of you for getting sober.