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I agree. It sounds like something disturbed your broody, enough to get her off the nest & up over the barricade. And she settled back on another nest with eggs, not knowing it wasn't her original nest of egglings.
It's up to you what to do with them. There is a chance that they will still hatch under the hen, especially if you put her back on them as soon as possible. And yes, they may be delayed in hatching because of the chilling. I've had this happen with a broody hen, she got off the nest right before hatch day and let her egglings get cold, but they still hatched. Or you could put them all in the incubator, and give the hen chicks when they've hatched.
This is why it's ideal to have your broody completely isolated/barricaded during her set. Other hens like to lay their eggs in a broody's nest, often pushing her off in the process. And broodys often get misdirected on their way back from their coffee breaks and go to set on a different nest.
By the way, I'm of the school of Leave The Broody Alone thinking, I never take my hens off the nest to eat & drink. Left alone they will get up when they feel it's best, usually only ONCE a day, to eat, drink & take a giant poop. They seem to know just how long to time their breaks, taking longer in warm weather, keeping it brief in the cold. I do watch them carefully to see if they seem to be neglecting themselves, or getting mites, to make sure they have sufficient food & water, to make sure they're pooping out of the nest at least once every other day or so. As long as they seem all right, I leave them alone.