Well, the good news is that if you wind up kicking her out of the house, when she gets clean and sober she'll look back and realize that you had no choice about it.
NOT!
Anyway, my brother lost like five jobs last year, sold all of his shit (big screen tv's, etc.), is living in a complete shithole, and has had his ass seriously kicked several times for owing people money and he still hasn't hit rock bottom as far as he's concerned. The problem seems to be that no matter how much of a fuck up you are, there's another person just as fucked up and the two of them just continue to flush their lives down the toilet while they bitch to each other about what a bunch of assholes the rest of the world is.