i have 4 hens, no rooster, 2 nesting boxes in coop, girls free-range. the golden-laced wyandotte has been sitting in her nest for 2 days, she puffs up and growls at me when i come near. the other hens have laid only 1 egg in 2 days but are acting normally. is she sick? does she think she's going to hatch eggs? and why might the others not be laying? empathy?