My 12 YO granddaughter used to help me all the time when she was seven. She seemed to enjoy it quite a bit. She is now 12 and no longer seems to like reloading. She still loves to shoot, though, so that is something. My grandson is 18 and just doesn't seem to enjoy anything. Enjoy her and tell her to keep up the good work.
2nd my kids 6 and 3 both love to help dad reload. My 3 year old just yesterday while I was putting up Christmas lights asked if he could go make bullets. Cause he knew how to do it by himself. YEA RIGHT
3rd George, just keep inviting him out. I remember 18. Its tough on a young man. Out of high school, pressured to start building a life and constantly asked SO, what are you gonna do now. Which collage to go to etc. Take him out, just the 2 of ya if you can. Tell him about how much shooting is a stress reliever and how stressed he looks. Don't talk to him about nothing but shooting, unless he brings it up. 18 is that 1st big transitional point. He'll appreciate the offer, even if he turns you down