Long COVID: What bloodwork and vitamin/supplement recommendations?

My daughter has debilitating fatigue as well as other symptoms (including but not limited to brain fog, cognitive issues, sudden onset nerve pain in feet, cough, shortness of breath). She's looking for non-western medical advice in addition to traditional. Any info you can provide would be greatly appreciated?

Two part question:
1) What blood tests do you recommend requesting for LC?
In addition to CBC, my thought was vitamin panel, ferritin bloodwork, CRP. Any others?
2) What supplements / herbs, etc. have been helpful?
All B vitamins, Vitamin D, Turmeric, Quercetin, NAC (not sure that that is, but read it in a posting), Magnesium, Zinc.

Thank you!