I have a 16 week old EE hen that I just noticed is being mopy and not moving around like her coop mates. She looks completely healthy, normal poop, clear eyes and comb, no mites, not laying yet and doesn't have a red comb yet so I don't think she is ready yet. What can I do to help her? She has a clean coop, food and water all the time, and plenty of space. Help!