I have three hens. Two have laid eggs since January 20. The third began laying very large softshell eggs for about a week. I began giving her yogurt and spinach. She laid two hard shell eggs and hasn't laid another one since near the end of March. She sits on the nest daily, but gets up and leaves without having left an egg. Do some hens never lay eggs or lay just one or two and stop? BTW, they all have access to egg shells and crushed oyster shells.