If she isn't being bothered by other hens you could leave her where she is at, but plan to have a secure cubby area fenced from the rest of the flock for the first few days after she hatches so the chicks get used to her vocalizations and learn to listen to her. Once you have raised a clutch or two you should have a good idea if any of the others in the flock cause problems and maybe the separation by fencing won't be needed, but for first time I would do it for peace of mind.
Watch her general body condition and give her high protein type snacks to keep her boosted since she is not out foraging or eating as much as normal. we do scrambled eggs, sunflower seeds and peanuts, tuna or other cooked fish, oatmeal with raisins or chopped canned peaches or pears in it, boiled liver chopped fine (I have an electric chopper that does wonders for making this stuff easier!), cat food, canned corn (rinse it first), fine chopped or shredded lettuce or cabbage and I usually switch my broodies over to chick starter also while they are setting.
