I can only share my general experiences, since I think I lost track of who was hatching what around the fourth broody.
My salmon faverolles are the BEST broodies. I have one with chicks right now. "Doe" had a failed hatch (human error), so I went to the feed store and bought her five chicks. She took to the little ones right away. Just like my other broodies to date, she's raising them in the coop with the rest of the flock. About a week after Doe got her chicks, my older chicks (5 weeks old @ the time) decided they wanted a mama again. Doe's SF sister had kicked them loose early, at about 4 weeks. So Doe took them in and is raising them along with her other five. Quite a sight to see one little hen trying to cover 5 - three week old chicks and 3 - 8 week old chicks.
While I was at the feed store getting Doe her chicks I decided to get a few extras for another broody, my silkie named Jethro. Jethro had hatched a single chick the week before and was still sitting on "air" waiting for something else to hatch. She was neglecting her singleton chick due to this. Jethro also took to her new chicks right away; I swear the chicken smiled when I gave them to her. Her singleton, Uno, was thrilled to have hatchmates too.
I've only had one chick injured by being in with the flock. That was one of Doe's first hatch. He was injured by a meat bird; again human error. I should never have expected good results with the meaties in the coop. He, Rowdy, recovered. Mama Hens are usually really good at protecting their babes. Jethro especially doesn't like my young cockerels anywhere near her babies. She has sent more than one of them running for the hills with their pride injured and their tailfeathers left behind.
I keep mama and chicks locked in their dog crates for about the first three days after hatch or until they let me know without a doubt that they are ready to bring the chicks out. For about another three or four days after that I leave the crate open during the day, lock them in at night. When the chicks start getting too rambunctious to be locked in a crate at all anymore, I just leave it open full-time. During that time mama usually doesn't venture outside with the chicks too much. If she does she sticks close to the coop with them.
After that they are just part of the flock, as natural as can be. They free range with the flock all day and go to bed when mama says so. The coop is always open during the day so they can go in to eat if they wish, but rarely do. Jethro in particular spends hours excavating the whole area around the coop finding yummy bugs and seeds for her babies. I provide extra waterers outside, check on them several times a day, but that's about the extent of my duties. Mama does the rest.
I truly believe that it's best to leave the chicks with mama until SHE is ready to cut them loose. She'll teach them everything they need to know about being a chicken. She gives them chicken smarts. I think this is especially important when you have free range flocks like I do. From a very young age the chicks learn to forage, fend for themselves in family squabbles and most importantly, how to watch out for predators.
Hope this helps.