Figure out some fun things to do with it. It took . . . well, a while, after I finally got some workable control over my duping before I saw it as something good, and I was about that age at the time.

One of the things that finally did the trick was my dad pointing out that I could get all my chores for the day done in an hour while still watching cartoons. Heh. For this girl . . . you said your mom said the light's pretty? Maybe hang a bunch of prism mobiles in a room and let her see what she does to them.