Some have found Botox helped. Some have done a small test first. This is sometimes done to check for reactions. Some research to find the best Botox doc who appears to really understand her condition would be worthwhile.

Has her neuro mentioned amantadine ? It is an anti-viral that has helped some with PCS issues.

Many have reactions to non-concussion bumps to sensitive areas. These minor bumps or touches are no concussions even though they can cause an onset of symptoms. The brain can learn a response that mimics a concussion response. A simple trigger can appear to be a concussion.

How is her sleep ?

I can't imagine having much of a memory if I was living with migraines. Any headache messes up my memory.

Namanda sounds like an extreme shot in the dark. Various Alzheimer's drugs have been tried for PCS with very limited results. But, at least her doctor is trying.