Is she a first time mom? She might not know what's happening to her eggs. I've never had my goose hatch eggs, but I did see one of my ducks when her first duckling was hatching. She tried to remove the hatching egg, as if it had gotten broken, but when she picked it up the duckling started peeping. It took her a minute, but she finally figured it out and put the egg back in the nest. In the end the duckling hatched and she was a good mom.
If your goose is actually removing shell before the blood vessels have finished breaking down, the gosling could bleed to death. I have also heard of ducks and geese incubating eggs, but then attacking the ducklings or goslings when they hatch, so I try to keep a close watch with first time moms.
Sorry, I don't have much experience with this, hopefully someone else can be of more help.
