So I remembered wrong. She was actually inside the nesting box and went to peck someone on the other side of the coop.
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She's probably not actually broody. She was in there, for more than half of the daylight hours yesterday, but she only hung out there for 2-3 hrs today.
Yesterday, she did help collect all the golf balls and fake eggs on that side of the coop into a single nesting box.
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She was outside by the time I went out with the dogs to look for eggs and give them a snack around noon today.
I'll keep an eye out, but I don't think there's any bullying going on. I see chickens chasing each other around at varying times of the day, but it's not always the same ones as the chaser or chasee.