I have a 10 mo old EE pullet, beautiful girl that lays a pretty blue/green egg. However, recently I noticed 3 of my other EEs are missing most of their beards and muffs - no blood but you can see bear skin. I caught her in the act and what makes it so bad is that they just stand there and let her pull out the feathers. I thought maybe it was because yogurt got in their beards so I stopped feeding it but she still continues. I got her and 3 other EEs last April and those seem to be the only ones she bothers. I have a mixed flock of 20 chickens and they free range on at least a quarter of an acre so boredom is not the problem. Since the area she targets is so close to the eyes, I am afraid to put any of the anti-peck stuff on the girls being targeted. Any suggestions besides rehoming her?