Sounds she is hiding her abilities. Check out these two articles for starters:

http://www.davidsongifted.org/db/Articles_id_10171.aspx

http://www.sengifted.org/articles_social/Reis_SocialAndEmotionalIssuesFacedByGiftedGirls.shtml

I have a boy, but I remember similar issues in my own youth.

You will get more replies from others who have first hand-experiences with their DDs

Hugs and Good luck!

EW