Egg crushed by hen, due to hatch sunday

Well I had a hen sitting on a dozen eggs and now I have a silkie chick alive in the incubator, due to hatch sunday with a completely crushed shell and a partially broken membrane. What do you think the chances on this one are. It survived the night so far. Wrapped what was left of the egg shell in a wet paper towel to keep things moist. The yolk is still in tact and no bleeding. I am not sure how in the world she did this but I am thinking I had another hen go broody so maybe they were fighting over the nest.