There are so many better things to teach an 8-year-old than how to make money. Instead of trying to raise $100k for a little website, why not teach the kid HTML, CSS, maybe even JavaScript so she can make one herself? It's not that hard, you'd be giving her a great creative outlet that would impress her friends, it would help her think logically, and it would likely pay off in her future a lot more than teaching her how to be an "entrepreneur".