She shouldn't.
You can stick the eggs in the incubator again, and leave the little chick with mom.
Or you can take the chick and leave the eggs. She will eventually leave the eggs,
because chickie needs food and water after about 3 days after hatching. Mommy
knows that and will gradually...
Low temperatures cause late hatches. If the temperature got low when the
power went out, then that is the reason why they are a little 'behind'. Do you
know what the temperature got down to? As long as your seeing movement,
or any signs of life, they should still hatch fine. Just late. You...