Now that I think about it I've never tried pining a hen down for bad behavior, so I'm not sure if she would just squat or not. Just try it out and see if it works!
Chickens have a pecking order, first is the most dominant chicken, that's whoever can make the other chickens submit. That usually means literally pecking their way up the order.
She sees you as another chicken, she needs to make you submit so she can still be top hen. The solution is simple...