Yes, if you let her sit in the same nest that the other hens lay eggs in, she'll just end up sitting on all the eggs the other hens lay for the next three weeks. If you have no rooster, it would be fruitless to let her sit on the eggs since no chicks will hatch from unfertile eggs.
Or you can...
She could be broody. Have you noticed her behavior changing over the last week? Low, deep clucking, irritable with the others, her soft tummy feathers showing up around the coop and nest boxes? When you go to touch her on the nest, does she scold you?
You could leave her there and see if she...