I still stand by my first response. It's a pretty sound one and it's the same I get every time something is up with my chickens. I had something go through my flock recently and I finally sent in a dead chicken for a necropsy and was able to figure out what was wrong. Aspergillosis - they had it in their respiratory tract. So while it was not contagious I then had the job of finding the source, taking care of it and culling the ill ones from my flock. But at least I knew what was going on. Sometimes we cannot know what is wrong without seeking outside help (necropsy or seeing the vet)...and it's often worth it to ensure the rest of the flock is safe. I have nearly all heritage breed chickens and they cost me bank- I needed to know if I had to start over because closing my flock was not an option.
This could be something as simple as an eye infection. Try Vetericyn drops in the eyes. But because you had a hen who had an issue recently, now this chicken...some diseases move very very slowly through the flock. Some chickens will become infected but maybe get it so mildly you may not notice and then simply become carriers- infecting new chickens. Or like I said maybe it's as simple as an eye infection. It's just hard to say without more symptoms. A vet visit could help rule things out. I know most people do not like to take chickens to vets but I see it as taking in 1 chicken as a representative of your whole flock. A diagnosis and treatment could then be made for the rest of the flock- the vet will not need to see each chicken.
Please keep us updated. I hope she gets better soon!
