I don't care if it is a kids show. We have seen primary characters get killed off in plenty TV shows. They would do a disservice to the PT if they kept Ahsoka alive. I don't think you understand the scope of the Grand Plan. One of the plan's primary objectives was to turn the Chosen One to the Dark Side. Ahsoka's death would help in that matter and it would provide much more incentive for Anakin to seek the ability to save people from death.
I highly doubt we will see her death. It is in fact a kids and they already borderline with some scenes. For example them having take off some of Ventress's executions. They most likely will continue it in a novel or comic.
EDIT: I fixed my mistake...