I have a chicken who isn't looking good these days. She'll be 1 year old in April. Her head is twitching, like a person with cerebal palsey might. I am talking beyond the usual chicken twitch. She'll be calm and her head suddenly jerks like we would if we had restless knees. I noticed this last week. This weekend I noticed she looked more like a baloon. I couldn't catch her yesterday, but this morning I made sure I went out early and got her while she was roosting, checked for egg bound and found just one egg, but her chest area is really thick and fluidy. I compared to anotehr chicken her breed and they have minimal puffiness like a chicken breast feel. But her's felt like she got breast implants! When she was born her right breast stuck out a little futher than the other, but now it;s all around. I really don't know what to do. She gets up on her roost. She eats/drinks - not as much as others. When we put in treats she doesnt fight for it, she waits her turn. NOt the sweetie I know usually. Any ideas and help?