I have a problem with one of my RSL hens. She is 1 1/2 years old. Her 5 siblings/same age are all fine and healthy. So are the other hens in the flock.(19 in total) After their last molt, a few months back, her feathers came in really thin and scruffy. It mainly seems to affect the larger wing feathers. She has lots of fluffy grey down. But her flight feathers seem eroded like they have been scratched or chewed away and she seems a bit thin. I found her on the nest yesterday long after everyone had laid and left and the other eggs had been gathered. She was sitting on a lovely egg but it had a soft chalky shell. I have been getting soft eggs occasionally and now I know from whom. Could she be having trouble absorbing calcium? She seems otherwise fine, running with the pack, and haven't seen anyone picking on her. Is there some way to increase her calcium intake without treating them all? They get quality feed with added calcium and ground up eggshells freely fed, but it seems she can't absorb it? I don't know what else it could be. Any ideas?