Please Help!! What is wrong with this chicken - inactive, lethargic

[Bawkbok]

All,
An update on our precious Lacey. She did not show any improvement after all our efforts and trying all that's been suggested. The Vet said it's probably Marek's disease due to the neurological issues she is presenting, for which there is no cure. We could have tried a couple other options but he said her prognosis is not good and we would have been prolonging the inevitable. We have too much love for her to watch her continue to decline. The farmer we bought her from did not and does not vaccinate for Marek's disease. A painful lesson on our part now that we know more about it. For our first time experience with chickens this has been a painful journey and hard lessons to learn.
Our concern now is for the only one remaining chicken we have (same farmer). The vet said the stress of her being alone might be enough to make her break out with the disease as well. Rosie is already not foraging, constantly looking around for Lacey and shows no interest in eating boiled chicken breast. She has never refused chicken before. What is the best way to manage this situation? We will get another friend for her but want one about the same age - 6 months old. Is this the best approach? Then there's the integration challenge. This is all so stressful.
Any thoughts or suggestions are welcome. Thank you

 

[Crazy Maizie]

So sorry to hear that. Was a necropsy done?

You might want to start another thread.
But, I imagine there wouldn't be as big of an integration issue with just 1 chicken. However, it is recommended to quarantine new birds for at least 2 weeks, but a month is better. Your new bird would be exposed to mareks regardless.
For now, you can try adding a mirror to her environment.
Also know that mareks is in the environment regardless of vaccinating or not. It's just that the vaccine gives extra protection to help the chicken overcome the disease.
Also, mareks is a leaky vaccine which means, it protects the the vaccinated, but if there is an outbreak it will attack the unvacinnated worse.
But, there are lots of people here on byc that has a mareks exposed flock and do well. I would look into those threads to learn more about mareks.