I am having an issue with one of our 21 week old Red Stars. There wasn't any problem with her at all until this past week when she has started to peck us really hard when we go in the run. I mean to the point where she drew blood on the hubs yesterday and today when I was in the run filling the feeder, she came out of nowhere and got me good enough to make my thigh bleed. She's sneaky about coming up behind us then attacking when we aren't looking. She's like a crazed ninja sometimes but not always. She's in a mixed flock of 15, falls in the middle of the pecking order and doesn't appear to be pecking the other girls and they aren't bothering her (I spend a lot of time watching them, chicken tv you know). Her 2 RS sisters are a couple of the sweetest birds we have so I don't believe it's breed thing. Any ideas of what might be the reason for her behavior? I really don't want to send her to freezer camp but we can't put up with the way she is acting now. Is there a way of working with her to stop this type of behavior?