My chicks are 6 days old. They are in a 4x8 coop tractor. I leave the door open, but the chicks can't get out. Mama has jumped out today and took a dust bath, then went back in, then jumped out again. The chicks peepeepeep. How long do Mamas care for their chicks? Should I close the door? The coop is all wire, with a roof, and sides that open up like wings to keep the sun and rain out.