Recommendations needed!

A friend of mine sent me this message:

I'm trying to choose a book to read to a group of 16-18-yr-old girls. They're my summer campers, I read them a book every year - usually featuring a strong, funny female protagonist. Do you have any ideas for a book I could reasonably read out loud in 5 or 6 days?

My first thought was Catherine Murdock's Dairy Queen.  You guys?  Thoughts?