Another thing to mention that may be part of her downward spiral - maybe she realizes how much work its going to be to really get her voice back into shape, and be recognized as a maturing artist.
Back in the day, she was always paired against Christina Aguilera, etc. Now, many of the pop stars from the 'hot Britney' era have gone on to really advance their careers, and have become respected artists rather than burnt out former teen-slut wanna-bes.
That's a tough road to tread - because that's who she'll be compared to, and she knows it. So, instead of digging in her heels and working her ass off, she's taken the low road and is spiriling further toward self destruction.
BV