I only went through one broody hatching episode, and I did not isolate her. It worked out OK as she was the top hen and could do what she wanted. I had hoped this would make it easier to integrate the chicks, but my lowest hen bullied them a bit so I had to watch out and pull her out when they were older and going to roost. And then for a long time I had chicks sleeping in a nest and getting them to roost took a long time! The other hens love my broody, though, so they got to hang with her 30 minutes a day when she was setting, and that was nice.
Sorry, can't offer advice on isolating - but if I had done that, I would have put her in a dog crate in the garage, let her out once a day (you can kind of determine when her time of day is that she wants to pop out - mine did about 2-3 p.m.). I backyard free range and let her take the chicks outside to forage when she wanted to - I lost one out of 8 chicks to a flying predator - they are a breed good at hiding from predators.