Helping here once she is drunk is not wrong. Helping her find a way to get drunk is where you could do better (from what you post)
"Drive me to the store"
NO!
"But I need food"
I will get it for you.
Driving her to get her booze is the one thing I would stop. She wants it, she can find a way to get it.
Co dependant No More is a good book for you to get. Al Anon meetings will give you a place of gathering info and support as well.
Look about and read the posts that say "sticky" beside them at the top of the boards.
You will find many wonderful people stop by here and share as well. Check back often.