Well, it sounds like this friend of yours has some positive qualities that you admire. If you think she's worth keeping as a friend, is it possible for you to have a serious chat with her about wanting to do things that don't revolve around bad activities - like too much drinking? Maybe you two could go out to dinner, or see a movie. Something positive.

If she doesn't want to stop drinking with you and/or only wants to hang out with you to get drunk, maybe she's not worth keeping as a friend if she's going to continue being a negative influence on you.