This book is part of a series titled The Princess Tales. Each book is a retelling of a fairy tale. This is a short, sweet book with an interesting twist. Rosella and her twin sister Myrtle are bespelled by a fairy. Each time they talk something comes out of their mouths - for Rosella it's jewels and for Myrtle it's creepy crawlies. What happens is an interesting journey for all three parties (the fairy included). All of the books in the series are just as interesting. I expect them to replace the fairytales of our youth.
With that said, I highly recommend Gail Carson Levine - her books are well written and entertaining. She has even written a book for teens on becoming writers themselves and that was an amazing book.