Originally Posted by
Rhode 
And I can't just let her fall. She is the mother of our children.
Actually, by preventing her from "falling" or from reaching that all important bottom, you are denying her the dignity of finding recovery for herself. It is obvious you love this woman; doesn't she deserve that dignity?
To be more specific, I think you need to address certain issues:
a) Childcare after school: either daycare or a mother's helper.
b) Finances: removing her access to the money you bring in, and perhaps purchasing certain services directly from the vendor instead of giving her money to do so (and to spent on booze).
c) Removing yourself and the children from her presence when she drinks
At this point, it would be a good idea to figure out your boundaries and start enforcing them.