It turns out this was a hoax. The most suspicious part to me was how aware the grandmother claimed the little girl was of what was going on. If what we're hearing now is true, the grandmother is an idiot; she thought she'd get away with this without even GOING to that KFC on that day? And if this was a hoax the money collected should constitute fraud.
Photo credit: By Kentucky Fried Chicken (http://www.logostage.com/logos/KFC.png) [Public domain], via Wikimedia Commons