It's also healthy to keep in mind, alcoholism is a disease. Alcoholics aren't drinking "at" us. It's not personal.
If your friend was suffering from some other mentally and physically challenging disease, would you have the same expectations of her? (((hugs)))
It's okay to love and care about alcoholics. It's simply a very counter-intuitive disease that effects them and friends, family and co-workers.
No diagnosis of alcoholism is needed for the non-drinker to reach out for support. Al-anon, Celebrate Recovery and other programs are available to us.