I just went through this too. I got a dozen fertile eggs and let her hatch them out. Most people will recommend that you remove her from the flock. I chose not to remove my broody. I do have 6 nesting boxes and only 8 hens so that was not an issue. She sat on the eggs and hatched out her chicks all around the flock.
Once the chicks hatched I sat a large box with betting in a corner of the coop with food and water close by so she had more room to care for them. She moved over to this spacious nest herself. Then she took the chicks out to free range at 3 days old. She brings them in at night to the larger nest while the other hens roost.
I choose not to seperate the broody mostly out of laziness! I do not have a seperate area for her and would need to build something. Also, I didn't want to have to reintroduce her to the flock or deal with introducing the chicks. Luckily, things have worked out great! She does a great job with them. The other birds leave the chicks alone and momma has plenty of space free ranging to keep to herself with the chicks.
While it is probably safest to seperate. If your situation is similar to mine (large coop, small flock, free ranging, etc), keeping her in the flock may work. But she may need a makeshift nest so your nesting boxes are free.
Here is our momma with her crew: