Yesterday evening I noticed one of my Black Copper hens acting strangely. She was on her perch, with ruffled feathers and a rather staring look on her face. I gave the rest of the crew some bread and they went nuts finding pieces of crust. She looked, but never moved off her perch. I brought her into the house and examined her. Her vent and abdomen looked normal, there was no coughing, discharge or respiratory distress. As of this morning, she hasn't touched any food or water, including treats (her favorite sliced orange)? Am I missing something? I haven't de-wormed her recently, but did not detect any external parasites? Any suggestions are appreciated.