I think the drinking is a way of self medicating for many with depression.. so working on that might need to be #1 if she is open to that or wants to get help..
We have a depression forum and an addiction forum that might have other info on ways to help someone..
https://www.neurotalk.org/forum31/
https://www.neurotalk.org/forum37/
Check the sticky threads too for #'s and info.