How much space, exactly, does she have? The first line, and your description in a previous post, reads like she has room to stand up and turn around and that's it. If that is the case, your broody needs more room that that - the lack of room is likely a contributing factor to her lack of eating and possibly also the issue of the egg eating. A broody hen needs to have the option to get off her nest, move away from it, expel her waste, get feed and water and then return to the nest to continue setting.
