If you can, get a hold of some Oxine AH, mix 1/4 Oxine to rest water and mist the heck out of everything, coop, cages, birds, feeders, waters , yourself.... it helps. it's like $21-25 a gallon, but it lasts. So sorry you are going through this, I'll be praying for you and your flock.
I'm so sorry. I know how you feel, I've been there. Mareks can affect some chickens, but rarely a whole flock. It is a form of Chicken Cancer, and can be very nasty, but your vet does not know for sure. Treat her with vitamins, keep her separated and use good bio-security measures. I'd order the...
With Mareks, typically it is often just one leg, and normally just on one side, I can't remember which side. They start off normal except with the one leg paralysis. Many things can cause a drunken walk. Head trauma, vitamin deff, toxins, mold etc..... Keep up the vitamin therapy and the things...
Some birds develop Mareks, some don't. Some birds seem to develop a natural immunity to it.
Often Mareks will start with one leg. Then it progresses up the body until the head and neck are compromised. birds often loose weight and get an unthrifty appearance. Mareks is spread by feather dander...
Trauma can cause in-coordination and weakness. Mareks is another worry. Treat her with vitamins and vitamin E gel caps. Make sure she stays eating and drinking. No worms in poo? Hope she comes through ok. Best Wishes