My two year old Australorp has recently just begun laying again after a winter hiatus. She laid a good half dozen eggs, regularly, every other day. Then for some reason she has started laying soft shelled or no-shelled eggs. All of em. bout the last six to eight of them. She has no other symptoms. She's alert, she's eating well, bright eyes, is at the top of the pecking order, has access to plenty of water, oyster shell, 20% lay pellets, and a Flock Block. My three other hens are all laying well, with no shell problems. Any ideas what this could be? And how can I remedy it? Thank you all in advance.