hi my silkies go broody nearly every 6 wks, they make a different noise and will race back to nest if removed, i put them in old dog cage or rabbit run for 5-7 days until they stop the 'moaning' noise and are less frantic, once i lift them out of the cage they dont make a beeline for the nest, then i know they are over the broody bit,but it can take over a week till they start laying. if they stay on nest where others lay they will put them all off and they all become very vocal. they tend to get noisy again when they start to lay again, If you keep on nest, make sure you punt them out for food and water a couple of times a day as a broody does not want to leave her eggs, even if not sitting on any!
good luck