She's stuck up on roost after 7 other hens have left. She paces back and forth, fussing and looking down. After 5 min. I lift her off the roost, put her down and off she runs. Her wings are not trimmed, but she may have lost a couple of outer feathers. Or, could she be having vision problems? The roost is about 6 ft high, two lower level rungs are at 5 and 3 feet. Has anyone else seen this happen? She lays an egg almost daily.