Yes, leave them with the mamma, and she will protect them from the others, and within days, the whole flock will accept the babies. It works wonderfully. One of the thing that I do, is place a smaller pallet on a single layer of cement blocks. This is high enough that the chicks can run under it, and over it, but a full grown hen cannot easily. A lot of time I sprinkle food down under it, so I am sure that the babies are getting enough.
 
Also, after setting for 21 days, the nest is less than fresh and some of the eggs might not hatch. Anyway, my broody has always left the elevated nest and created a new nest on the floor of the coop. So before they hatch, I make sure there is fresh bedding on the floor for her.  And another trick is when the chicks are about 4 weeks old, I place a wide board at the level of the roosts. And within days, she will have those chicks up there. They can still snuggle next to mamma for several more weeks.
 
A week and counting.