Coming from a two alcoholic parent household I'm going to say that you need to STOP beating yourself up right this minute about not doing more to stop her. You couldn't stop her--you know this--unless or until she wanted or WANTS to stop, Cathy. So don't feel guilty. Don't. You can't. All you can do is be there to pick up the pieces of her as she rehabs.
A good thing is that she's in the hospital where she'll dry out under medical supervision. That's a plus. So if she can get out of there and stay sober..... well, it might be an easier path for her.
But hang in there.... I understand the pain. You were her friend before and you'll be her friend afterward. And that's the important thing--the friendship. She's got a hard road to travel to get her functionality, if she can, back.
You know where I am, woman, if you want to talk--any time you need it.
Taking time for you or for things in your life ALWAYS comes before being on the computer, my dear woman.