Bensmum is right, as are your friends and family, if she is an alcoholic her first love and priorty will be the bottle. She will not change because you offer her love and security, that will only make life easier for her to continue as she is.
The only person who can change her life is her and this is a decision she must arrive at alone.
Certainly, offer her any support you can with out becoming emotionally involved but if that is not possible then I suggest you remain her friend but on the periphary of her life.
Alcoholics are selfish, only thinking of their next drink and you will always be second to that.
I do not say this to upset you, I say this because up until two years ago I was just like your friend. No amount of love or support changed me, I abused the help I was given for my own ends, hurt my family and friends, got into difficulties both financially and emotionally, basically my life was a mess (as was I).
I made the decision to stop drinking and life could not be better but until then I had nothing to offer anyone. What does your friend have to offer you at this point? No doubt she is a fine person with great qualities but she also will have all the associated problems that go with alcoholism.
Think carefully, and I wish you and your friend luck.
warpig