not really an expert but what I do know is it takes 21 days, give or take, of brooding for an egg to hatch. After about three days since the first chick hatched the broody will abandon the eggs remaining and take care of the chicks. That would be a good time to move her where you want her, if at all. She will still be quiet and keeping her chicks warm and not wanting to go anywhere and you know all who are going to hatch did.