Never care what someone thinks about you! What matters is what you think about yourself & that it is positive. The girl in this story cares too much about what other kids think about her and it ends her up with a bad case of the stripes!
This would probably be an I on the Fountas & Pinnell chart because it is elaborate and uses a good bit of dialogue.
The activity I would use from this book is actually one I am stealing from a past student... Jess Smyly tweeted pictures of herself with a bad case of the stripes after she read this book to her class! Kids would LOVE THIS!!! It really helps when teachers do funny things like this to keep the kids interested in reading.