I can see this going down two ways:
#1. In this "kid-friendly" approach Ahsoka will survive The Clone Wars and Order 66. Kids would hate to see this character die in the series, escpecially since she is aimed more towards them. She will go into hiding and eventually be revealed when the Empire is defeated. In this option kids don't get crushed, and George gets more money from all of the Ahsoka related books and comics he will now be able to make.
#2. In this approach she will be killed in The Clone Wars or in Order 66. She would either die in the show, making kids across the globe sit their with their mouths open and older fans cheer, or in some random comic book. She would most likely be killed by Count Dooku, which would make Anakin hate him even more and be willing to decapitate him. With this option George would get more respect from the older community for tieing up loose ends, and would be hated by the younger groups for killing off a beloved hero in their eyes. And when she dies Jar Jar will instantaneously explode for no reason. What, a guy can't dream?