I'd probably go with American Girl
advice books and possibly follow-up with the printed page of Recommended Links from the About Us page of the Ophelia Project. American Girl books cast a wide net by touching lightly on a broad spectrum of topics.
You may wish to learn whether the school library and/or local library have any books which you may plan to use. Oftentimes, by prior arrangement, libraries will accept books and place a dedication inside, such as: "Donated by GS troop XXX, 2015".
Choosing and donating one or more books may provide a small service project, help raise awareness of the issues, and may become an item for a school newsletter, website, GS publicity or local media coverage.