I know it's not a solution for all, but I have cameras installed in the coop and run. This allows me to keep and eye/ear on the chooks from a computer/phone/tablet and (via dropcam service) scroll backward in the footage to get to the source of any issues I notice during my time with them. Really handy to scroll back and observe the bratty cockerel behavior at roost-time, the pecking-order issues, etc.
In fact, I've found the most difficult thing with having them under such Orwellian conditions is to NOT rush right out to break up every little fight and bullying episode. Chickens have been being chickens millennia before we came along with electricity and cameras to creep all up in their business. Cameras are great tools to observe and learn and (only when needed) address the infrequent issues of serial-bully chooks. Assuming you have adequate space for your chooks and ready access to quality food/water, as long as your bullied chook seems otherwise happy/healthy and there is no bloodshed I'd say let things play out a little longer. It's more than likely that she'll learn to move faster to avoid the antagonist in the future. That is the pecking order after all...those with submissive personalities give way to those with dominant personalities.
The more we interfere with the pecking order (aside from very serious case-by-case issues of course) from a human-standard slant of "ALL bullying is bad", the more problems we are likely to cause in the henhouse. My vote is for letting chickens be chickens if all their basic needs (space, security, food, water) are being met.
