If a hen is smart enough to incubate eggs and get them to hatch chicks then you can trust her to be smart enough to care properly for those chicks. It'll be lots of fun to watch her with them too!
Of course it's still a good idea to oversee their activity, but I try not to interfere unless there's a big problem, a chick stuck somewhere & can't get out, or something like that.
The Mama will probably sit on the nest for 24 hours or maybe even more, waiting for everyone to hatch out. The first to hatch will have enough food to go on from the yolk it absorbed, and it'll cuddle up under Mom's wings while its siblings hatch & dry. Then Mama will take the whole brood out for its first meal & drink. And will probably treat herself to a good dust bath to make up for lost time.
If any eggs are left unhatched, she might go back to the nest and set on them some more. But those usually won't hatch, though there may be live chicks in them. You could try sticking them under another broody, or in an incubator, and Mama might even adopt any chicks who hatch. Maybe not, and then you'll have orphans to raise. Chickens seem to play a numbers game, and are satisfied if just some of their eggs hatch. You don't have to go to extremes to hatch any leftovers if you don't want to.
Congratulations on your hatch! Right now I have 3 hens with chicks, another who hatched some on Thurs, and another hatching some tonight. Chicks rule!
