She was all alone. The only one out of the 5 eggs. She was eating and drinking. I know how to hatch eggs and my incubator may not have a humidity gauge or what ever but I've hatched birds from many species. My aunt figured lack of protein because she's seen the same thing with chickens, ducks, geese, emus, ostriches, rheas, and pheasants and it was the same cause for the feet, lack of protein. I don't plan on buying a humidity gauge. If you help a chick out to early they bleed out through the umbilicus cord, and to late they might die inside the egg. Can't take the chick out of the egg. Once the chick has started and there hasn't been any progress for like 8 hours then you can chip a few shells away. The chick has to push itself out. Thor and Calypso I've watched drown mice in their water bowl and then leave them.
One egg hatched out of 5? That is about a 20% hatch rate. Do yourself a favor and DO get a humidity gauge, if the humidity is too low at pipping/hatching time, it will CAUSE them to die in the shell. We move our eggs to a hatcher for the last 3 days and we jack that humidity up to about 90%, as I said in my other reply, we had a 90% hatch rate with all our hens on 16% protein layer feed for the entire season.