Go to her website...
http://www.marlaolmstead.com/
You can see all the available paintings and all the old ones. When I watched the movie I thought all her paintings were great except Ocean, but looking att all her paintings I thought most of them were awful, and that there were maybe five that I really liked. Consider that, and that she possibly painted a lot that we never will see at all, and it isn't so hard to imagine that one painting of twenty will be pleasant to the eye. Even if she were blind she would succeed once in a while.
Also the biggest difference to her art and the ones my kids produced is that she fills the canvas with colours from frame to frame. Most kids won't do that, and that lesson alone separates her from the kindergarten stuff that other kids produce. (And yes I do belive the father was an inspiration and a teacher for her, and both greedy and smart enough to see that he could make a buck out of it. And I don't think it was anything wrong with it, the kid seemed happy enough.)