It means you should stop messing with them... I think you will get the best hatch rate if you literally completely ignore her. Not sure what that black would be but they have the best chance of survival if you practice the art of "no touchy".
My hen got 5/6 eggs to hatch all by herself... You do not need to mess with broodies.
Edited by BantyChooks - 4/28/16 at 11:06am