I'm not a huge fan of the American Girl merchandising machine, but several friends/moms I respect sugested this book for my nearly 10 year-old. I wish they had something like this when we were coming of age. Sure, we had "Free to Be You & Me", but this is very well done, straight forward and has opened up the lines of communication between my daughter and I around what can be very difficult subjects - The Care and Keeping of You: The Body Book for Girls (AmericanGirl Library)
Following the Ultimate Guys’ Body Book comes the ultimate book for girls, a trusted, must-have handbook for girls heading into puberty (and their parents) with Biblically sound and medically reliable advice on your changing body---from a Christian perspective.
New to the Faithgirlz! series, The Big Book of Quizzes offers a fun way to look at yourself, your quirks, hobbies, habits, favorites, and more, to learn more about yourself, set goals, and discover ways to become the best you possible.
10 Ultimate Truths Girls Should Know by Kari Kampakis is designed to help you and your daughters navigate the years when it's easier to focus on what the world says than what God says. (And really, isn't that ALL the years, including the adult ones?) I can't recommend it enough as a resource for parents to use with your daughters.