At the moment, I do not have a lot of information on the chickens condition. I wasn't able to check the chicken out fully before she went to the coop to sleep. I figured it was probably hard enough for her to get to the coop that I shouldn't disturb her. My Lead hen, who also happens to be my oldest hen, has suddenly gotten ill within the day. She was completely fine this morning, but when I checked her in the evening, she was head nodding and did not want to get up. She also has lost a lot of feathers and is molting, which im assuming is a stress induced molt due to her illness considering none of the other chickens are molting. None of the other chickens in the flock are exhibiting her behavior. Since I just discovered this, I do not know how her eating and drinking has been, and she has not been quarantined yet. ( Partially because I don't have a space to keep her aside from with the flock.) I also picked an egg from the coop today, and when we cracked it open, It was VERY rotten. The whole egg was green and blue and darkly colored, and it was FRESH that day. I am not sure if my ill chicken laid this egg (I'm assuming she probably did since shes the only one who's ill and the other eggs are fine.) Her stool is slightly more liquid than usual, and redder, But i don't think its blood and It's not exactly so bad that I would say its diarrhea. ( Also since this issue just poped up, it may not be showing in her stool yet.) When I checked on her in the evening, she was in her roost with her head bobbing, like she was trying to keep herself from falling forward. She was also sleeping as far away from the other hens as possible. Tomorrow I will clean our their chicken pen, since I have no in a while and it definitely wont hurt to give her a new clean environment to be in. I'm very worried because I have been looking up the symptoms and seeing what other people have said, But a lot of them say their chicken died before they could treat it, and in some cases the medication was very expensive. I unfortunately do not have the money to spend on treatment, so I'm going to have to stick to home remedies and hope for the best. I will check on my chicken tomorrow and examine her as well as take pictures so i can better understand what is happening to her.