I mentioned it on your introduction post but I'll mention it here, also. Starting in September, Pride School Atlanta is supposed to be open and primarily will be for LGBT students. It's will be a private school with tuition costs but worth looking into if she has any problem with her public school.
I don't know where you are in Georgia but PFLAG holds meetings in Atlanta (North Druid Hills), John's Creek, Marietta, Peachtree City and Stockbridge. PFLAG Macon doesn't hold meetings but someone from the group will meet with you. Also on January 17th PFLAG is having a panel of parents of three transgender children of different ages. One parent of a 5 year old, one of an 11 year old and one whose child is over 20.