I've always left my broody hens in the coop with all of the chickens when their eggs hatch. That way the new chicks are integrated into the flock and are not picked on as "newbies" if they were to be added later. My broody mamas are always very protective and they make sure the other hens stay away from their chicks. The one thing that I always do when I know the eggs are hatching is move the mama and eggs (or newly hatched chicks) into their own wood box (on it's side/straw in it) on the floor and turn it halfway towards the back corner so that the mama has some privacy and the chicks are semi out of sight for a few days. This way the other hens can hear the chicks, but leave them alone. I also put a small waterer and feeder next to the box for the mama and chicks. By the time the mama brings the chicks out to explore the coop and outside, in 4-5 days, the other hens are used to hearing them and leave them alone.
As far as broody hens hatching out eggs, my broody hens motto is "the more the merrier!" They will sit on any size and any color egg and happily hatch out standard or banty chicks as their own. I've had standard hens hatch out banty chicks and banty hens hatch out standard chicks.