PCS Mother,
Welcome to NeuroTalk, I am sorry for the struggles you and your daughter have been going through.
I reposted your post so those of us with visual struggles can read it easier.
Has she ever been tested for hormones? Hormones can cause a myriad of symptoms. Most doctors use a shotgun approach for hormones so finding someone who specializes in accurately balancing hormones is important. Check
https://www.womensinternational.com/..._referral.html for someone in your area.
There is a book that might be worthwhile. It is called "The Maker's Diet" by Jordan Rubin.
Is anybody working on treating her upper neck for her whiplash and dance injuries? An Upper Cervical Chiro (NUCCA.org) may be helpful. Or a very gentle Physical Therapist with some gentle traction and manipulations. She does not need range of motion PT right now although range of motion will be a good diagnostic to see how her neck is functioning. Avoid any twist and pop chiro treatments. They are likely too aggressive right now.
As you said, this last concussion may have put her over the top. Let us know what other symptoms are her biggest struggle. As you have noticed, there is lots of good help here.
My best to you.