Information at the following links on the Davidson Database may be of interest...
1- Advocacy - Working with your child's school http://www.davidsongifted.org/db/Articles_id_10558.aspx
2- Choosing the right school for your gifted child http://www.davidsongifted.org/db/Articles_id_10511.aspx
3- Basic educational options for gifted children http://www.davidsongifted.org/db/Articles_id_10270.aspx
4- Guidebook - Advocating for Exceptionally Gifted Young People, plus lists of other resources http://www.davidsongifted.org/db/browse_resources_165.aspx

For learning about the other "e" in your 2e advocacy: the book From Emotions to Advocacy by Pam Wright and Pete Wright

You may wish to read up on all you can, then visit with your child's college prep school to present the information and see how well it is received. If it does not seem like a good fit, you may wish to visit other schools, have your daughter shadow, and work toward choosing the learning environment with the best (or least-worst) "fit".