I would strongly consider taking a trip to meet with http://www.patriciagatto-walden.com/index.html

The financial cost might be high but it seems like it would be well worth it to be able to help your daughter. Probably you have read the articles on the SENG website about emotional intensity in gifted kids, I found lots of helpful info. there. Also this book could be helpful:
http://www.amazon.com/Living-Intensity-Understanding-Sensitivity-Excitability/dp/0910707898