My 1 year old leghorn hen, who is usually the most cocky and vocal of my flock has been acting strange for the last 2 days. She's laid 2 shell-less eggs and has been sitting in the same spot in the bushes today and yesterday. Usually when I come out to feed them she is the first to run up. I still see her eating and drinking but she is acting very slow and mopey, she is almost hunched over when she walks, as if she is roosting. Only other symptom is her poop looks a little runny and stained her backside. None of my other chickens are acting sick. If anyone could give me any ideas of what might be wrong with her or any ideas what I should do it would be greatly appreciated!