I have 6 pullets, all at 17wks of age. Two of them, a barred rock and a red sex link, have been maturing faster than the rest. The RSL started squatting yesterday. She has always been at the bottom of the pecking order but my chickens have never been violent towards each other, now she is getting pecked pretty hard by one of my black sex links. Does this have something to do with her maturing and getting close to laying?