McC... We had a hen that began staying either on the roost through the day or frequently in a nest box and would come out when we were around. Our hen did it that time because one of the Roos was stalking her! Each time the poor girl went out trying to roam with the rest he would jump her. Poor thing would come running/flying full speed to us and take a flying leap into either our arms or to land on our shoulder when he chased her... he ended up in freezer camp and she came out and roamed freely with the rest after that. If she is missing feathers on her back from the roo he may be fixating on her too much and she feels 'safe' in the box. Maybe get her a hen apron to protect her back because it may be tender also...I have been looking, and cannot find my answer. Penny is a 9 -month -old Columbian Rock Cross. She lays about five days, off one. I have not seen an egg for her in about a week. I considered that she may have taken to laying on the floor (with some of the newbies), but the past 2 days she has been in the nest box. She doesn't seem stressed (struggling) and she comes out within a few minutes of my being in there. No egg. I checked her for being egg bound. Nothing. She is missing some feathers, but it looks like she is being mounted too much. I don't see mites. Could she be thinking of going broody? It is the only thing I have read that is left for an answer. The odd thing being that the most eggs are on the floor in the corner. Wouldn't she be laying there? That is where she (and the hens I had) was laying several months ago before I got new nest boxes (and put them where the 2-month-olds wouldn't be running around!).
If it's not rooster induced then I would go with the hormone induced option, she may be 'trying' to go broody and just hasn't committed to it yet.