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OK, a lot to sift through.
I would her in a separate part of the coop with her own food and water. I would put the nest box at or very close to ground level. Within a day or two of hatching those little peeps are going to be exploring and will have to be able to get back in the nest. With that in mind eliminate any potential traps or escape routes for those little guys.
It would be nice if the broody and chicks can see and hear the rest of the flock. If the rest of the flock can see and hear the new family it make acceptance of the new guys easier.
Eight to 10 eggs is probably OK. I think they should all have been laid withing a few days of each other but I might be wrong.