I don't know how to help you with religious only books, but I wanted to suggest:
Body Drama
and,
Deal with it!
I bought both of these for my sister for her 'coming of age' at 14. Before I gave them to her I read through them both and took several pads of sticky notes to write down my own opinions, thoughts, experiences and other notations... I stuck them all over the pages of both books, intending for her to read them and feel like I was right there with her talking about each issue.
The books are amazing, I can't recommend them highly enough - however they are not religious. They talk about sex and sexuality as a fact of life (including masturbation and GLBTQ issues), but I'd strongly strongly suggest you at least take them out of the library and look through them... she found them really helpful, not only that but she told me later that every single one of her female (and even some of her male) friends borrowed them. They were passed not only through her friend circle, but her classes, her school... through everyone! AND SHE KEPT ALL MY NOTES ATTACHED!! FOR YEARS! So now all of her friends know everything I wrote about my life to help make the issues more approachable for my sister. This includes topics like eating disorders, depression, suicide, sex, virginity, masturbation and pretty much anything else I talked about in there. Oops.

Oh well, at least it's for a good cause.
