Uhh. I think they are pretty loaded for life. Just a guess.
She's a little girl! You ask how a widow and two children are to survive? First of all, I'm sure they have millions, so $ will not be a problem. But even if not the case, why would you expect an eight-year-old to contribute to her family's finances?
You also state that she needs a life and purpose. Sure, but at eight years old, shouldn't she just concentrate on attending school and getting through the loss of her father with the rest of the family?
The "purpose" of a child's life is merely to live, grow, learn, make mistakes, learn again, and be free from pressure. It's brutal to lose a parent at that tender age, but she's not the only kid in that situation. Lots of kids have lost parents in Iraq, but they don't go public and fill the void with a song and dance routine. They work through it, live through it, with the help of family, friends, teachers, clergy, etc.
As far as money, if they need money, which I very highly doubt, you don't send an 8-year-old kid out to be the bread winner. I am sure Steve had life insurance, plus substantial business ventures that will support his wife and kids. I saw her interviewed on TV last night. Her answers were so rehearsed, canned, unnatural for her age. I do so hope she survives all this in good shape.
And, as the article points out, Bindi is accustomed to the spotlight. They still have to eat.
THis child needs a childhood, not a career. Or if she were mine, I would nix this idea. But she isn't mine so I guess her Mother will let her have a go at it.