My BR started laying the weekend after Christmas. She laid pretty regularly for 2 weeks. Then she laid a thin-shelled egg on 1/9. The following day she laid a shell-less egg. She hasn't laid again. She is on layer feed, has all the requisite calcium supplements. I don't think she's molting. Her flockmates are still laying. I've palpated her abdomen a few times and it feels normal. Any ideas? I'm trying to figure out if I should be worried, and if so, what to be watching for.