Hen who is on her last leg

[Eggcessive]

Update- We haven't been able to get any dewormer yet, but my hen, Matt, has been kept inside with some food, water, and rest. She's doing much better. She's standing and able to even walk a little, her other eye is now open, and she is pretty alert. She's eating and drinking a good amount as well. When I was talking to a family member about my hen, she was saying that Matt's symptoms were similar to that of a stroke. Matt had temporary paralysis and seemed like one side of her body was lame. Can chickens have a stroke?

Eggcessive- The 3rd link you posted states how the owner gave her chicken penicillin injections. Would it hurt to give them to my hen just in case they might work?

I would try penicillin or even Baytril if I thought she had egg yolk peritonitis. Many people report that it can prolong the life of hens with EYP. Here is a link for it--dosage is 1 tablet twice a day for 5 days given by mouth: http://uspigeons.mercasystems.com/index.php/enrofloxacine-pigeons-products.html or the injectable: http://uspigeons.mercasystems.com/index.php/enroxina-pigeons-products-6989.html Procaine Penicillin G is available at most feedstores in the refrigerated medicines. Dosage is 1/4 ml given by a shot.
Strokes would cause permanent paralysis, I would think. Mareks disease can cause lameness on one side, and sometimes it can get better before the disease progresses causing tumors. Here are a couple of links to read about Mareks disease:
https://www.backyardchickens.com/a/the-great-big-giant-mareks-disease-faq
http://extension.unh.edu/resources/files/Resource000791_Rep813.pdf

 

[cluckcluckgirl]

I read the big article about Marek's disease. It sounds very similar to what my hen went through. She's the only bird out of 30+ chickens we've owned to experience these symptoms. They have no contact with other wild birds and no other chicken is showing signs like this at this time. We got her and 8 other chicks at a feed store about 2 1/2 years ago, but I do not know for certain if they were vaccinated against this. They were from Nutrena. It also said that a nutrient deficiency could be the cause of her symptoms. She was always one of my smaller girls and I did notice that she wasn't eating enough as she should have been when we had to pull her inside.