Hello Robb-
a)first I agree with Kris’s ideas above.
b)second, I would strongly consider a trial of plasmalogens, maybe first the Glia (to help heal  damage/inflammation due to the initial infection, then head trauma, then CoVid.)
Then if the fatigue/brain fog type symptoms remain, I would change to Neuro (plasmalogens).
While these are expensive, I find you will know right away (like first few days) if they are helpful and needed. So, you would only need to continue them if seeing big changes.
c)lastly…”absolutely” to Kris’s BPC…. I suspect her BBB is pretty “leaky” after all of that.
Hope they improve!!!
-Cynthia