It's a toss-up. If it were my own birds, I doubt it would work. Babes need to imprint early. And it might upset mama off the nest. My turkey hens get very attached to their babes. One hens did a February hatch of her own eggs this year; sold all but 4 and wanted to let her raise them- however it was just too cold. Every night I'd find them half-froze somewhere in the coop, mama calling to them to come back to the nest. One babe got separated too long and died So I took them away. The next morning that hen tore apart all of the nest boxes; just gutted em, calling for chicks. She promptly went brood y again.
If we're talking 4-6 days and I HAD to choose how to do what you're trying to do; I would put the babes with mama now and pen her in a small flat space. Turkey poults are slow to leave the nest since eggs from a natural clutch may have a few days difference in hatch time. If she DOES want to get up with her poults, she can't go far. I'm talking put the food and water within reach of her, so she can feed and water herself and the babes without leaving the nest.
I've found that if there are still eggs on the ground, my broody turkey hens WILL NOT leave to take care of chicks. They will absolutely not leave unhatched eggs on the nest.
I hope that makes sense? In summary; I'd give them to her now, put food and water right in the nest with her, and monitor. If she's a good mama she'll feed the hatchlings and keep sitting eggs. If she's a good mama and does decide to get up for short periods of time with the poults, she should cover her eggs with feathers/nesting to keep them warm.