Thank you for sharing your experience with us. I understand how difficult it is to see our children in pain no matter what age. Let me see what information I can share with you that may be helpful.
When you get a chance take a look at this link regarding children and migraine;
1) https://migraine.com/migraines-in-children-and-teens
2) https://migraine.com/living-migraine/supporting-children-with-migraine
3) https://migraine.com/living-migraine/children-manage-pain
4) https://migraine.com/living-migraine/school-growing-up
When my son was about nine years old he started having migraine attacks. I kept a journal of them, his symptoms, and potential triggers. We were able to determine some of his attacks were triggered by dehydration, too much or too little sleep (keeping a regular sleep schedule is important for anyone with migraine) too many nitrates, and becoming overheated. Maybe this is something you could consider doing for your daughter. Let me share a link with you on how to keep a migraine journal; https://migraine.com/blog/keeping-migraine-diary-basics.
It's sounds like you've seen a number of answers without much luck. The next step may be to see a pediatric headache and migraine expert, of which there are not a lot of. What area of the country do you live in, that way I can take a look around for you. Here's why I ask, general neurologists may be fine doctors but have a hard time being experts in one area because they treat many conditions such as stroke, epilepsy, multiple sclerosis, Parkinson's and more. A true migraine/headache disease doctor treats migraine and headache all day, every day and have additional certification in headache medicine not all general neurologists have. Here is more information on how these doctors are different and how to find one;
1) https://migraine.com/blog/really-find-headache-specialist/
2) https://migraine.com/living-migraine/neurologist-vs-specialist
3) https://migraine.com/living-migraine/change-thoughts-new-care
4) https://migraine.com/living-migraine/evaluating-doctor-patient-relationship-right-fit
5) https://www.ucns.org/Online/Online/Diplomate_Directory.aspx?hkey=f8f00552-f924-4ef6-a9bb-6023b1cd341b
That last link is a general one, if you put your state and dig through the list you may be able to find a pediatric migraine expert.
I've given you a load of information so I'll stop for now! Please let me know if you have questions, we're here for you both!
Sending your daughter pain free wishes, Nancy Harris Bonk, Patient Leader/Moderator Migraine.com Team