I'd let the hen set. Much better to have her do all the work - that's what she was made for! Think about it. The temperature and humidity are always just right. You don't have to turn the eggs. She'll take care of the non-developing ones. You won't have to put them in a brooder after they hatch. How much better could it be?
Chickens most certainly can brood their own. It is something natural and they know what to do. Being able to rear its own young is not something that can be bred out of an animal. like stated if she is broody let her sit if not what have you lost? Good luck