Well help could mean a lot of things - however, if she doesn't want it not much you can do. I have an Aunt who has stayed with a beligerant alcoholic for over 50 years.
Anyway...asking her directly if she wants help...getting her to a T to help her work through doormat vs assertive issues and codependency issues (just my personal opinion on what you have written so far).
Not sure if this works but here is the link for the post I was talking about...
http://forums.psychcentral.com/showf...5&o=31&fpart=1