I built a larger coop almost two months ago so my six girls coud spread out a bit. They seem to have all adapted pretty well. They have all been laying pretty consistant except one. She ( red sex link) looks healthy eats well interact with the others but hasnt layed an egg in over two months. I take that back. She layed one egg about a month ago and the shell was really thin ang a much lighter brown than normal. I thought it was kinda funny when she layed that egg because her best bud was sitting next to her in the nesting box. It was almost like she was helping her. Nothing since then. I have noticed what seem to be just busted yolks in the nesting box several times. I know it's cold here in PA and I have a 250w heat lamp that runs from 4pm-12am and from 4am to 7am. The food is the same Layina pellets. Will she ever lay again??