We have 4 one year old hens. All have been laying well. Last 2 weeks or so one of them (I don't know which) has been pecking at the egg (see picture). She doesn't eat it entirely, just pecking and then left in the nest like this: I've been trying to come out early to remove but still missed it sometimes. Then I tried putting several plastic eggs (Easter type). Apparently she pecked those too (I often found them separate in halves), and that helped save a few eggs, but not all. The feed store recommended giving them oyster shell which I have. No difference. Then they say find the culprit and make soup with her. I'm not ready to do that! HELP!