Wow this is a lot to deal with! It sounds like you have taken all the appropriate steps to establish healthy boundaries for yourself and your family with regards to your mother's drinking. My mother also has an issue with alcoholism and I know how heart breaking it can be. I think the hardest thing for me is to mourn the idea of what I want our relationship to be and to try to accept it for what it is (within my boundaries).
You should be proud of yourself that you acknowledged that you needed a break for yourself and that you acted on it. Remember to take care of yourself first.