The book is great fun and I highly recommend it. It's a fun and light-hearted fantasy adventure that isn't afraid to poke fun at conventions, and is full of loveable and funny characters. You should totally go check it out. :)
The book's own description: "Susan wants to become a hero and what better way than vanquishing a dark lord? But she gets in over her head quickly, not only defeated, but transformed into a pet dragon for him. But this is only the start of her quest, as to cure her curse, she undertakes a mission for the dark lord himself. Stuck transforming into a dragon, whether it's convenient or not for her, she must face everything from demons and monstrous beasts, to hostile plush toys. With her companions, a dark faerie dragon and a diminutive foxling mage, she may just become the hero she's attempting to be, or she might end up becoming a monster."