My hen that went broody in spring has gone broody again. She's sitting in the box, screams at us when we go in there. She has no eggs and won't get out. She comes out to eat very briefly, runs around like a nut and runs quickly back to the box. We had her sit on fertile eggs in spring and she hatched out 2 chicks and was happy for awhile. She even started laying again. What to do?