I found one of my hens today sitting alone in the corner of the yard. She is normally very active. When dusk came she did not attempt to get up and go inside the coop. She is normally one of the first to go inside. When everyone was in she still stayed in the corner. Her feet were very cold and her butt was kinda dirty. Not really bad just from sitting in the same spot all day. I bought her inside and cleaned her up. Checked her vent, no impaction from what I can tell. She wouldn't drink alot, didn't touch her food and has her eyes closed more often than not. She seems kinda drowsy and not active. Any ideas?