I don't think this is the book you're talking about, but Confessions of a Shopaholic is kind of like that. The woman can't afford her credit cards, etc... It makes me feel a lot better about my measly $1,000 debt, though!
All three of the Shopaholic books are great....
The name of the book that I read this summer was Elegance. It is an excelletn book...
Silver
Threaded Mode