My wife and i are new to chickens, we have a small backyard flock of 4 ISA browns. They are all good with each other and my wife. Three are good with me but one pecks at me aggressively. The girl that pecks at me loves my wife and is very gentle with her, she just started acting aggressively to me. What can i do to stop her behavior towards me? I did push her away from me today and she stayed away after i did that.