Mama is essentially just returning to the nest at night to sleep with the hatched chicks. The eggs just happen to be in the nest. When a broody leaves the nest with hatched chicks, she's done "sitting", it may seem that she might be coming back to "sit" because she's on the nest, but that's...
I wouldn't consider this abandoment. She has chicks that are 5 days old already, how much longer would you expect her to sit on eggs when she has chicks to tend too?
Usually a broody is up and out moving with chicks, eating/drinking within 24-48 hours of hatch.
I do have a question - there's a...