One more thought: I was planning on creating a brooding space for her on the floor of the coop that is only large enough for her to get into. I thought this would help her be safe and be a place where the chicks could hide if they were threatened by one of the big hens. Would this be sufficient?
I don't do anything like that, but a safe haven is a good idea. One thing I would watch for though is do not set it up where the chicks can mingle with the other hens and the broody cannot get to them to protect her chicks. If you do set up a separate area for the hen and chicks, make sure the chicks cannot get through the fence. Chicks can die if the broody cannot get to them to protect them. I had that happen once to one chick. The chick got into a grow-out pen with some 8-week-olds. Mama could not get into that area and the 8-week-olds killed it.
Thanks for the advice. I was planning to have the safe haven spot located inside the coop and large enough that both hen and chicks could fit under it. Since my broody is the smallest hen by far I can make a space that is too small for the other hens but big enough for her to get into with the chicks.