One of my chickens has been practically living in one of the nest boxes for the past few days. She has not layed an egg. She is (almost continually) making a quieter version of the loud noise the girls typically make just before laying. She has lost some weight, but I think that is primarily because she's not going to the food & water. We have been carrying her out to the food & water a couple times a day and she eats, drinks, poos, and runs back to the nest box. I had her in a crate for 24 hours with food & water in front of her (she was eating & drinking), but she was not really happy with that, so I let her out tonight. She ran around for about 10 minutes & a lot of poo came out (they don't go in nests, so I think she was holding it the entire time I had her in the crate.) Then she ran back to the nest box. I just went to check on her & the status is the same. I have checked her vent -- it is not red or swollen, and there does not appear to be any discharge leaking out. There are no worms in her poo. Her eyes look normal. She is walking and running normally. She is not molting. She is 10 months old. Any suggestions? Could there be an egg stuck?