My 2 yr old speckled sussex hen has been acting a little funny today. She is very lethargic and has been sleeping in the corner of the coop all day. Her comb is blue and droopy, and when i picked her up and put her in front of food and water, she drank a lot, but didn't eat anything. She also has yellow diarrhea that started last night. She hasn't laid an egg, so is it possible that there is just an egg stuck? If so or even if it's something different, what do I do??