She is letting the others know she is on top of the pecking order. If it's really bad, I would put her in the run while the others get a chance to eat. But, it should work itself out in time. I really would chase her away, tho, and let her know that YOU are the top hen!
You can also try and take the hen out for a few days. By taking her out, she looses her place in the pecking order, (depending on the ages of the other birds) and when you put her back in, she'll be low man on the totem poll.