You should still make a point of proving your superiority any time you are around her. A broom is perfect because you won't hurt her and it gives you a long reach. Hopefully she will learn respect and you can put the broom away.It's only a problem when food is involved.
The top hen only has to look at another to get them to submit. You rarely see the alpha hen resort to pecking or attacks. I find it's the hens that are close to the bottom who commit most of the aggression. I think they are trying their best to not be the lowest.