Hi, I have a buff Orpington that's a bit more than 5 months old. She's usually a quiet and weak chicken that doesn't play around with the other chickens so much and sleeps very often. She always has her feathers puffed up. The temperature where I live ranges from about 50 - 75 degrees Fahrenheit. I bought her when she was about a week old and I have been feeding her layer feed ever since she was 1 week old then switched to medicated chick feed about 2 months ago then recently switched back to layer feed (I still individually feed her some chick feed so her diet is about 1/2 chick feed and 1/2 layer feed). She is an especially light chicken compared to her friends and she has a very small and pale comb that never seems to grow. (she hasn't laid eggs yet) Recently, her balance has been getting worse, and sometimes couldn't standstill. Today, when I went down to see her, she was still in the sleeping area while her friends were all outside. Her neck looks twisted and she's the weakest I've seen her ever since I've got her. She has been drinking and eating but less. She barely moves and stays in one area for hours. I have noticed she has been recently been pooping some very watery diarrhea.