I just don't see any leeway in the rule especially since it hit her as she was swinging evidenced by the fact the ball lands in fair territory that allows a ball to be called. I guess you could have some bizarre scenario where the ball hits the girl then by some reflex or instinct she made a swinging motion AFTER being hit. I might be stumped on that one since technically it is a dead ball BEFORE she swings but given the rule specifically mentions swinging at a ball that hits you is a strike I would probably still call it a dead ball strike.
The same goes for a girl whose arm/hand is in the strike zone, you have to ask yourself assuming the ball did not hit her would you have called it a strike if the answer is yes then it is still a strike if the answer is no then she takes her base.
The same goes for a girl whose arm/hand is in the strike zone, you have to ask yourself assuming the ball did not hit her would you have called it a strike if the answer is yes then it is still a strike if the answer is no then she takes her base.