The National Center for Women & IT has a new resource out on recruiting young women into HS computing classes: http://www.ncwit.org/resources/top-10-ways-recruiting-high-school-women-your-computing-classes/top-10-ways-recruiting.
You can order these in hard copy by visiting www.ncwit.org or emailing info@ncwit.org.
You can view and order all the NCWIT high school related resources at https://www.ncwit.org/resources
Highly recommended:
Which Computing Career is Right for Me?
How do I Prepare for a Computing Major?
Girls in IT: The Facts