My 1-1/2 year old EE has become broody. She sits in one of the nest boxes all day, but has not laid an egg for at least a week now. When I open the door, she squawks and gets her feathers all ruffled. When she finally decides to come out in late afternoon, she's very grumpy and squawks at everyone. How long will this stage last? Is there anything I can do to get her laying again?