So I'm totally new to having chickens of my own. So far all my chicks are doing really well except for my 6 or 7 week old White Leghorn. I noticed about a week ago that she was not moving around the pen like the others, even when they stepped on her she would not move away from them. She was still eating fine and drinking her water like normal. I carefully took her out to see if she would get up and walk but she just sat there and peeped at me. She is a layed back chick so I cant really tell if she is lethargic or not. I put her in a pen by herself so the other chicks would not get ill if she was. She still eats and drink as much as ever but about 3 days ago her poop started coming out green. I move her around the pen from time to time because she just sits in her poo. She has no problem with being picked up and seems to actually like it. I don't know what to do! Is it bad genetics? Injury? Illness? HELP!!