Hello, I have three ladies that used to be inseparable. They would share the same nesting box, walk the yard together (they are free to roam the whole yard all day until night when I lock them in the coop)... Now one has separated, does not sleep w/ the others, stays in her nesting box all day unless I drag her out (figuratively) and then she will walk around for about 5 min then straight back into her box. When I go near her in the coop she fluffs up her feathers & "crabs" at me. This has been going on for a little over a week. She seems to be eating, because I put food in front of her like blueberries, sunflower seeds, her feed... She has always been my consistent layer, 1 per day, but today it was elongated w/ ridges.The ladies were purchased together and are about 8 mo old. Any observations would be very helpful. Thank you!!! p.s. I noticed a hawk once about 4 days ago but have not seen since. Could he have scared her?