ok... the nest box is a medium dog crate. I could put the door on it to keep the other hens out. They all lay in her nest even though there are 3 other boxes! I have to pull eggs out every day.If they are so close to hatch I would not move her unless there is a problem with other birds interfering... she can easily be moved after hatching since the chicks rarely roam much the first day. her nest can be blocked with hardware cloth on hatch day if you are worried about chicks falling out of it. If you do need to move her I would do it when it is dark and quiet and hopefully keep her area dim for a while after the move. Watch her closely though because if she freaks too bad she could scatter the nest and eggs.