I would very strongly encourage you to contact Patricia Gatto-Walden. It would be expensive to travel to see her (to Denver or Florida) but she does phone consults and she gets gifted girls, and has worked extensively with PG teens. If anyone would be able to help and understand how the giftedness plays into what ever is going on it would be her.

For example, she has participated in this camp http://www.educationaladvancement.org/pages/programspages/yunasa.html
for HG/PG kids for many years. I really think it could be a great investment to get her POV on how you can help your dd.