I have a lone chicken who has been yawning, shaking her head and having loose poop for a couple weeks. Yesterday I noticed white formy material coming from both eyes, and she was shaking her head a lot to fling it off. Later in the afternoon, it had stopped. I shecked closely and she had no wetness from her nostrils and her mouth looked clean (no plaques). She doesn't make any audible noises when she yawns; no audible rales. No smell from her mouth/head area (coryza symptom). She seems to have the bouts of yawning and head shaking after she eats, but could do it at other times when I'm not looking. She has not been eating her crumble except a little if I fling it on the ground. However, she will eat treats such as cheddar cheese, pomegranite, sunflower seeds and kiwi. She occasionally will eat dried meal worms and some Feather Fixer. She has been drinking fine. She had round worms visible in her poop mid August, so I dewormed her with Safeguard followed up by Valbazen, with that last dose 8/31. She weighed 1914 gm on 8/31. She had a long molt starting the end of August. She is fully feathered now except for a few feathers on her head, which seem to have been the last ones to fall off, and now there are a smattering of shafts I see for new feathers. She lost a lot of weight (down to 1325 gm at her lowest) during the molt, but yesterday's weight was 1690 gm. I suspect she was heavier about a month ago, but hasn't been eating as much in the last two weeks, and probably lost some weight. Her run is sand, and I noticed she has been eating more sand, maybe trying to get more grit. This morning, her eyes looked okay except for maybe a tiny bit of white foam at the front corner. Nothing like yesterday. She ate a little cheese and then took a drink of water. Shortly thereafter she started shaking her head and yawning. Her heat also seemed to have a little tremor. I brought her in to the basement in a dog cage to observe and warm her up. She has stopped yawning and shaking her head now. I have thoughts that it might be gapeworm, damage from gapeworm, mycoplasma gallisepticum (MG), some other respiratory illness, others? Prior to her flockmate dying from internal laying, I had that chicken tested for infectious bronchitis, and she was negative. At the time, that chicken was a lone chicken. I had her tested before adding this chicken to keep her company. This chicken with the problem now has been a lone chicken since June of this year. Any thoughts would be appreciated.