My hen has been acting strange for a few days. Her tail feathers are pointed down, she looks as if she is bearing down,...for lack of a better description. Today I cleaned up her back, she had a lot of poop stuck to her. Her one eye is also shut. I tried to give her fruit, yogurt and a nice juicy worm and she is not interested in any of it. She is isolating herself. I am a true novice and REALLY worried about her. Any advice would be appreciated.