First, could you answer a few questions for me so that I can try to make a better diagnosis:
How do you know that it is not Marek's Disease?And how old is she? Is it possible that she got into some moldy food or ate something else rotting?
Is the leg really paralyzed, or does she just not put her weight on it. Try pressing the bottom of her feet with her fingers. If she curls her toes around them, she isn't completely paralyzed. Also move her legs back and forth and compare the paralyzed leg's strength to the normal leg.
Is she isolated? If she isn't already, I would do so. Put her in a cage/crate with a good layer of bedding and a low roost (if any). Maybe try some scrambled eggs, applesauce, or yogurt to entice her into eating. If she doesn't eat or drink on her own, you will have to hand feed her.
I once had a chicken that couldn't walk (for a still unknown reason). He got weaker and weaker, until he wasn't eating or drinking on his own. What I did was mix together some chick feed crumbles and water until it was a very soupy mixture. I would place this mixture in a plastic spoon and dip his beak in it. He would swallow it bit by bit. I also gave him applesauce mixed with probiotics, electrolytes and vitamins. With handfeeding for about a week and a course of antibiotics, he got better.
You could also try tubefeeding him. Just type in "tubefeeding" in the search box on this website, and some links will come up to learning how to tube feed. I myself have never, done it, so good luck!
Keep us upadated!
