I remove my broodies to a large cage with food and water on the ground and no bedding, grass is preferred, but not always available. A roost also helps. They pace around the first day or two, but them you can interest them to peck around at some sunflower kernels or scratch, but not too much. I scramble an egg and give them half. It can help to have a friend if you have a large enough pen. Mine is 6x7 feet with a tarp, but many use a wire dog crate. Mine break in 3-5 days usually, and when I release them in the evening, they will let you know if they are still broody by hoing into the nest box. Just stick her back in the crate for another day or two, and try again.