We have two hens, Annie and Lily. Annie was a pullet we got in April 2013. She starting laying in September 27, 2013 and has laid for two years without going into a molt. My other hen, Lily, same age molted last winter and laid her last egg on Dec 19, 2013 and started back on Feb 11,2014. Annie is now slowing down to 2 eggs a week with very thin shells. One was in the nest with a partially completed shell even though I provide oyster shells for them in two different areas of their outside and inside run. She doesn't appear to be losing feathers as Lily did. My question is whether she is molting, not eating her oyster shells, or is she sick? She doesn't act sick and eats her layer crumbles and scratch just fine.