Well yeah, but that's really sad.
There was a news anchor on CNN (I watch a lot of CNN at work) talking about how any time a celebrity goes into a rehab program, they may get better, but regardless, when they leave they end up going right back into the same lifestyle. They have the same money, a lot of the same friends not all of whom have their best interests in mind, etc. Of course they're gonna go right back to it. I could imagine that being an especially difficult environment in which to try and overcome addiction.
Anyway, I never listened to much of her stuff before, but a friend of mine put on a CD of hers the other night and I was actually rather impressed. Not really my style as I'm not often into "retro" music, but she had a very good voice.