I am sorry you hen is not doing well.
I just lost one a short time ago that did have Marek's and I think that your hunch may be correct, but I hope not. None of my other birds are sick and it has been about a month. The wait and see part is the worst, it isn't over yet.
Check out this link.
http://extension.unh.edu/Agric/Docs/mareks.pdf
What made me think about Marek's in your hen is the red bumps and the balance problme. Mine didn't have the bumps, but she couldn't walk and had problems holding her head straight. I had a necropsy done and they were pretty sure it was Marek's, even though no other birds are sick and there have been no other birds here. She was about 8 months old. I will never know where it came from.
I hope I am wrong. It seems there are so many problems that look similar that it is hard to tell what is wrong while they are alive. I nursed mine for about 3 weeks before she died. Good luck and please keep us posted.
Check out this link.
http://extension.unh.edu/Agric/Docs/mareks.pdf
What made me think about Marek's in your hen is the red bumps and the balance problme. Mine didn't have the bumps, but she couldn't walk and had problems holding her head straight. I had a necropsy done and they were pretty sure it was Marek's, even though no other birds are sick and there have been no other birds here. She was about 8 months old. I will never know where it came from.
I hope I am wrong. It seems there are so many problems that look similar that it is hard to tell what is wrong while they are alive. I nursed mine for about 3 weeks before she died. Good luck and please keep us posted.