We have mean hens that attack any lower ranked broodies. Once the broodiness breaks, then the hen reintegratea with the mean hens without a problem - it’s the broodiness that they object to so things go back to normal when she stops being broody. Some other BYC poster stated that the flock is objecting to low ranked broodiness because only the dominant hens are “supposed” to be raising chicks. I don’t know what they are really thinking, but I’ve had both low and high ranked hens go broody recently (I have a lot of broody birds!) and the high ranked hens are not attacked but the low ranked ones are attacked by all... I have to separate broody mid-low ranked hens for their own safety, either to a broody breaker box or to a rabbit hutch with eggs if I want them to incubate and brood chicks. In my flock, once they’ve successfully hatched chicks, even the low ranked hen/chicks are able to return to the flock without getting attacked more than normal. Hopefully your hen’s broodiness breaks soon!