We need support in our lives but we and only we can make the decision to make change. I remember a friend having a "mini" intervention by coming to my house a few years back and tossing every bit of booze in the house. She dragged me out (I was passing out drunk) to a diner for coffee. I was pretty upset about it and the next day....I stocked up on my booze. Thing she didn't know was that I don't suck up any drop of alcohol around. I have certain things I drink and I would find the money and means to buy what I wanted.
I got sober......alone with plenty of money to buy more booze etc. because I couldn't live that life anymore.
Doing the right thing. Your Mom should seek help for herself. It is horrible how our addictions affects those who love us but until we want to change our lives there isn't much they can do for us.