I have a white rock hen that had been acting strangely for a couple of weeks. She'd been slow and sometimes just looked "out of it" and stared into space, then one morning I saw her thrashing around in the run and then she lost consciousness. I thought she was near death so I separated her from the other chickens and put her in a small pen and kept my eye on her thinking she probably wouldn't recover. She came around a couple of hours later but very weak and pretty much slept the rest of the day. The next day she started eating again and seemed to want to go back with the others. I kept her separated 2 more days and put her back with the others. She seems perfectly normal now, plenty of energy and acting the way she used to. Any ideas what would cause this?