Eggs were bad and starting to smell. I found some four day olds on craigslist. I waited till she was off the nest and switched out the eggs with the chicks. I kept the door cracked and watched for when she came back in. When she did, she puffed her feathers up and walked around. She walked up to one of the chicks and pecked it in the head! She pecked a few others too. Reckon she knows? Will she not mother them now?