My Scout (golden campine) is about 2/3 the size (and half the weight) of her GLW, Delaware, and Welsumer broodmates, but she is the head hen on our place. She is undeniably the boss around here.
When a hawk was circling the pen (perusing the buffet, as my DH said) last winter, she went out of the covered pen and into the yard to retrieve my EE who was still unaware of the danger and herded her back to the relative safety. When this year's girls get out of line, she is the one to discipline them. She isn't mean, just firm and clearly in charge.
She harrasses us when we get home until someone opens the gate for them to get out in the yard, and she is always the last one in the coop. She is a great little hen.