I am really hoping you look after yourself too...
I am nearly 21 and my mum was an alcholic. It wasnt until recently did i understand she wont change for me, and no one else for that matter. She will have to want to change for herself. As much preching and care you show her, it will never work.
It is good you joined here for support, as you will get it, and as i have too.
Im sad to say that i think the best thing has happened - the kids moving in with their father. Maybe soon (hopefully) she will begin to realise that drink will only push people away.
Wishing you well always & forever