Fluffy, my white mutt, about 8 months old, one of my best layers, was fine this morning, ate and laid her egg. However, late this afternoon, as I was calling all for their evening snack, she didn't come running as usual. I went over to pick her up and she appeared fine, no injuries, not in any pain, no discharge. I took her to the run and she did poop a little, brown diarreha, and she did not eat. I isolated her in my spare henhouse and she settled down like she was going to lay. I fixed some apple cider and yogurt and she gobbled that up just fine. 15 minutes later, she laid a shelless egg - I believe this is the first time she has ever done this!!! Her eyes are clear, breathing fine. No lice. Feed is layer crumble with oyster shell. Evening snack, lettuce, yogurt, sometimes oatmeal or rice or beans. I often mix oyster shell in, too. Other seven hens are fine. How series is this?