Congratulations!
So cute aren't they!?
I'd just watch close and make sure they don't have mites on them. Repeat dusting your broody in 5-7days to help kill off any mites that have hatched out.
I put the dust in a sock and use it like a powder puff, tap it onto the feathers, then work the...
Dust her with the Permethrin based poultry dust. I'd put some of the dust in the bedding of the new nesting box and stir it around as well.
Mites will kill chicks, so you want them gone before they hatch.