I have a Barred Rock hen, 1 year old, that has spent the past few weeks just sitting in a corner of the coop. She will eat if food brought to her, and is drinking water. Can't find any injuries. She lets me hold her and I take her outside for some sunshine. When I take her out of the coop, she will pick at grass a little, get a drink, and run right back to her corner. No idea what is going on. Anyone seen anything like this before?