Outrageous Acts And Everyday Rebellions by Gloria Steinem -- The must-read Gloria Steinem book for learning about women's rights issues.
Franny and Zooey by J. D. Salinger: Perfect for any girl feeling seriously alienated from her peer group or going through an intellectual or spiritual crisis. My mom gave me this book the year I graduated from high school and said it really helped her when she was my age. Lo and behold, it basically saved my soul.
Prep by Curtis Sittenfeld -- An unbelievably realistic account of being an outsider at a boarding school.
The Bell Jar by Sylvia Plath -- This book recounts loosely what Sylvia Plath was up to when she was that age.
Middlesex by Jeffrey Eugenides -- A very unique coming-of-age story wrapped in a family saga.