I'm not quite sure what's up with one of our hens, Emma. We've got 4 young hens, all of them have been laying quite regularly for about 2 1/2 months. Last month one of them got broody for a week, and after we put her into an isolation cage she came out of it and started laying again. On Sunday we put all four of them into a second enclosure (which is full of grass) while we were mucking out their enclosure and cleaning everything. They've eaten a lot of grass and seemed to enjoy it.
Ever since then Emma has been mostly staying in the coop, sometimes sitting in the nest box, sometimes just being in the coop. I feed them corn and mealworms as a treat (not much, just half a cup full for all of them) and they usually gobble them down, including Emma. Since Sunday she does come out of the coop when she hears us coming, but she only sporadically pecks at the treats, and today she was just walking around the other hens and ignoring the treats.
I picked her up and checked everything - her vent is fine, I couldn't find anything hard around there (no egg is stuck), her eyes looked clear, she was walking around like normal. Her crop was empty though. She drank as well. Oh yes, and she stopped laying eggs
I couldn't see any mites or worms (I treat them with diamaticious earth).
Not sure what's wrong with her! We thought initially she's broody, but when she comes out of the coop and I get the eggs out, they are cold, so she's not sitting on them.