She could be one, can't tell from the picture. Does she have a poufy face? On occasion, it is possible for a recessive gene to pop up out of the blue in a line of purebred birds. I had this exact experience in my Ameraucanas and mine were not hatchery birds! They were descended from show stock and Cree lines, at least on one side of the family! One had a couple of feather stubs on her legs plus she was beardless, obviously not a desirable trait in an Ameraucana. So, it could be from way, way, way back in her ancestry somewhere, who knows?