Sounds like "a moment of clarity," as they say, rather than a breakdown...
Yes, or perhaps a healing crisis, as they say.
I'm not really surprised by this. IIRC, Jewel lived in a car with her mom for while, and they still have an odd too-close relationship. I suspect she's got some pretty deep issues.
Regarding her teeth -- she's self-conscious about them the same way Mariah Carey is self-conscious about the left side of her face (don't know quite what's up with that, but you'll never see a photo of Mariah taken from her left). I think she's pretty cute even with her Brit-style denticia (maybe she'd be happier in England ;).