That would be very unusual. Once they are up with chicks they don't usually set on anymore eggs and if the other eggs do hatch they will usually reject them, at least in my experience. Need to find the nest, but more importantly get them in the coop. Look for them tonight.
Hmmm, not my experience. Obviously the hen has been in your coop most of her life, but she was laying eggs outside and hatched them outside of coop? I had a hen do that. I put the food and water in the coop and she came in and ate and drank with chicks and I caught them all and set them up in...