I have one hen who insists on laying on a window sill in my barn (we turned one stall into a coop). It is about 6 ft high and stone. Sometimes the eggs will fall off. Is there anyway to get her to lay in the boxes? Most of the other hens will lay in the boxes, but sometimes I will find a stray egg in another stall. It's like an easter egg hunt every day! Any hints to move her or should I just let her go?