A cute premise, but this book probably would have been better if it was half as long. Half way through I actually thought, "I don't see how they can make this conflict last another 150 pages." Well, they really stretched it out, creating all kinds of silly rules about what will and won't work to get someone out of a picture book. They also could have used a continuity person on the book. Early on, it explains that whats-her-face is a social pariah at school because she accidentally busted a cheerleader's kneecap playing softball, and then later on in the book it says she did it by tripping her at track and field or something. Hello!
I also wasn't convinced by the mom's concern. What's so crazy about reading a book? The mom compares a teenager reading a picture book to a middle-aged woman drinking from a bottle (or something). Uhh... Anyway. It was fine, but not exactly something I'd recommend spending time on.