She'll be dating before much longer (if she isn't already). That will greatly increase your odds of outside positive motivation.
My youngest didn't need anything but a good example, but I got off easy. A couple years back, at 15, she lit into one kid who was spouting off about how evil guns are, evil assault weapons, etc., thinking it would impress her as he hit on her. She said, publicly turning him down in a crowded lunch room: "I've been shooting since I was seven, and I got my HE card as soon as I was old enough. Probably you were playing with dolls. Probably you still are. I load my own hunting ammo for the 6.5 rifle my Dad built for me. You're hitting on the wrong sex. I'm female and date actual males, not pretend ones. Maybe you'll have better luck with your mother." So far she has shown excellent taste in boyfriends. We all shoot together.