My lot won´t eat egg. If they´re feeling poorly, I usually get them eating again by putting bits of lettuce floating in water with niacin in it, it works wonders, but if she can´t even keep her head up, it sounds a bit doubtful. It´s good the food´s gone through her now, at least that may have given her some sustainance. Can you not put a couple of the other goslings in with her, or is she too weak to cope?