My 1 year old hen is sleeping a lot, and has been for almost a week. I thought she might be broody but she is not doing the fluffed up feathers and the broody sounds. She sits away from the others under shelter looking miserable. Today I noticed that she has liquidy greenish poo, and a very pale comb. The rest of the flock have no symptoms. I wormed them all about a month ago. What other signs should I check for, and what can I do?