Maybe she's just in a fowl mood.... hahaHubby does the main work with them, but I try to spend time each day giving them treats etc so they know I'm part of the team.
I would just treat her like a roo would. Are they doing the mating squat yet? You could just put your hand on her back and just jiggle her around a little like when a roo mounts. That'll assert dominance.
If no roos are present then alot of times the dominant hen will assume the role of flock protector and the top of the pecking order.