A friend of mine (I'll call her D) had three hens. The neighbor's dog broke through her chicken fencing and killed two and injured the third. D has been on the run for about 2 weeks and has not been home, and hasn't dared to leave the chicken outside, even in the pen, so it's been locked in the little coop with no light except what comes through a few cracks. There's no window. D is going to be gone during the day for another 5 days. How is the lack of light going to affect this hen? It can't be good!