I've done it and I like when the hens handle the hatching mess. I always let the broodies raise the babies because I'm not a fan of the dust and mess of a brooder and heat lamp. Now is the time because bonding begins when the chicks begin making peeping noises from in the shell and the broody answers them. The broody is the perfect temp and humidity for the babies during incubation and hatching - we can only imitate what she does naturally when we incubate in an incubator.
She is a little early in her broodiness to accept eggs. If it was her first time being broody, I'd say maybe not, but an experienced broody will probably do fine. I had 2 broodies brooding in the big pen; their hatches were due over 2 weeks apart. The black Frizzle (2nd time broody) hatched her eggs and was wandering around the coop with her new brood when the Welsummer hen (first time broody and less than a week on eggs) caught sight of the chicks. She came out of her nest making classic loving mama sounds to the babies and holding her wings inviting the babies under her. Of course the black Frizzle went ballistic on the Welsummer trying to woo her babies away and attacked her. I moved the Welsummer to a dog crate outside the coop because I really wanted her to finish her own eggs and not stress my Frizzle out. She finished her hatch, but it looked like she was ready to adopt the Frizzle's chicks, if only my Frizzle would've let her.
