He wasn't very descriptive about how she really got it, so I am just as confused as you guys.
Was the end of the gun made out of rusty nails?Did she impale her finger/hand on said nails?If so, that explains everything!If not u dumb son.
Touching metal will not poison you unless it's a poisonous, reactive metal. BB guns are not made of poisonous, reactive metal. She could get lead poisoning from ingesting the BB pellets, though.
i dont think BB pellets are made out of Lead considering how toxic it can be, and how soft of a metal it is.