Vitamin E and selenium are the ones I was trying to think about yesterday that give the best chance of recovery from a vitamin deficiency.
The vitamin B is giving energy, but not the actual vitamin deficiency that causes the paralysis.
It's awesome that she seems to be showing signs of improvement!
Did you see the other birds keeping her away from the feed? Or is that just what makes sense to you? If in fact it was the other birds keeping her away that caused a "deficiency", how will she be reintroduced and assure that doesn't happen in the future.
I have never had a bird YET with that issue. As they pay attention and run around and eat anyways since the others don't hover over the feed all day long.
If it were Mareks, she would have died weeks ago.
Not sure what makes you think that... My birds lived for weeks with it before I personally cut their throat.

And plenty of birds go through what you describe and recover to walking and such. Yep, mine were bright eyed and ate veraciously the whole time.
I also remembered what they call the strains that kill faster... very viral.
The pain you describe is something I don't quite understand. The one time I thought I had a deficiency that turned out to be Marek's, showed no signs of pain. And lots of birds with a deficiency bad enough to cause wry neck never seem to be in pain from what I can remember reading. I know each case may be different though. Consider this part of the discussion for my learning purposes. I'm not trying to talk you into believing something else is wrong.
Have you ever checked for worms via a fecal float? It is usually around $15, and could be one reason for a deficiency if there is one. In which case your supportive care may only work short term if the root cause isn't solved. If you can afford to have it done any vet can do it doesn't have to be avian. You would want a species load count to make sure and treat with the correct thing if needed. But I would never worm an ill bird without confirmation of that issue as it taxes their system and could just make them worse.
Hope you continue to see improvement!
