You know, I bet she is getting off once a day when you aren't looking. She will lose weight so you don't need to worry so much about her. At least yours are cooped and not spiteful... my darn broody clucks up a storm, runs up the the house, eats the cat food, flips the water dish, leaves the hugest broody poo right in front of the door, takes a quick bath, and goes back onto her nest just waiting for the sound of humans disgusted at what they just stepped on.