I have a one and half year old barred rock hen who is showing possible signs of Marek. I have 6 backyard hens in my flock and all were vaccinated as chicks. This past Wednesday night, Agnes (the barred rock) was found sleeping under the coop instead of inside. I went out to check on her and she seemed out of it and disoriented. I put her in the coop where she just stayed on the coop floor. I went out to check on her in the morning and noticed that both eyes were closed and she was still in the coop. I put her in the run and decides to try terramycin ointment on her eyes thinking it might be an eye infection. Later that afternoon she was opening her eyes a bit and was more alert, but I noticed her eyes were cloudy. The last few nights I've had to go out, put her in the coop, and then put her in the run in the mornings. She will eat if I put food in front of her and she will drink if I put a thing of water in front of her. She is aware of sounds (such as food going into their feeder or filling up their water), but she can't seem to find the feeder or water. I have continued putting the terramycin on her, hoping it would help. She keeps her eyes open more often now, but they are still cloudy. She moves around, but she is slow and still seems disoriented. We noticed a massive lice/mite infestation on her last night (the other hens had very few to none so it seems isolated to her since she is sleeping on the ground and not moving overly much). We gave all 6 a permethrin bath today, and cleaned and washed their coop with the permethrin. She hasn't moved much since the bath and just kind of falls over. If she tries to move she falls or loses balance (she is still wet so it could be the weight if the wet feathers). I believe she is blind due to the fact that she is unresponsive to me moving my hands in front of her eyes. Her pupils have not changed shape or anything like that, but they are large and are unresponsive to light. Any thoughts about whether this could be Marek's or something else (and possible treatments if it is something else), would be greatly appreciated. Thanks!