I have a some white leghorn hens that were supplying me an egg a day for the last few months and now it just stopped kind of all at the same time. But at the same time it slowed down, one girl wont come out of her nest box, its been over a week. another one did it to but she jumped down when i came in today bc there very flighty and nothing was under her, and then she went back up in the box and is still there to. do they lay on nothing and think they have eggs under? as well as how often has a leghorn gone the whole 21 days in the broody state??? thanks