My chicken "Jeffrey" started laying eggs at about 6 mos.( 1 per day) She will be a year in 2 weeks. In the last few days she doesn't want to go outside, she is pulling out her feathers, her stomach is bare ( 2" x 5") area, she stopped laying eggs .. the last egg she laid she has been sitting on ever since.. I'm new at this but I don't see how it could have been fertilized. There are a few younger chickens up at the farm but no roosters..Jeffrey is a big black chicken, I'm sorry I don't know her breed..I think she was supposed to lay blue eggs..anyway I am worried about her..she's usually so personable and now she doesn't want to come out of her cage.. any thoughts?