One of our four hens - a three-year-old Barred Rock - doesn't want to eat when I release the hens from their coop at dawn, even though she always used to dig in right away with the other three as soon as they got out. Instead, she roams around the pen and even hides under the coop, making what sound like plaintive noises. Her appetite picks up later in the day, though. She wolfs down her share of the snacks we give the hens around noon and in the afternoon, and she seems to be laying. She gets around fine and does not show any signs of injury. We did switch to a different brand of pellets a few weeks ago. Maybe she doesn't like them?