I had the accidental luxury of having another big coop to move the hens into when one of mine went broody, so I did. I moved them about 5 days before the hatch. It was the best for my broody hen so she didn't have to deal with anyone and could just take care of her babies, but as it turned out a few days later, whenever one of the other hens or young roos came around to investigate (they free range during the day) she gave them 'what for'. They didn't stand a snowballs chance in hell. She was fierce!
the upshot of this is; if you can, it's best, but she'll probably be ok if you can't - not as sure about the babies. 8 is a lot of babies and chickens can be awful mean to young ones.