I dont know what has happened. My SLW has laid several nice eggs so far and today she was puffed up and still had the white membrane of an egg hanging out of her and i found the clear, no yolk, in the run. I have oyster shell offered at all times and feed the layena crumble. Is this a comon thing to happen?? She is 20 weeks old and she has laid about 5 perfect eggs so far.