My cousin lost a little girl in comparable circumstances. She made her way behind a work van in the driveway and was struck when her uncle, my other cousin's husband, backed out. He name was Olivia.
It's likely I've driven that van. I've definitely been in that same driveway in a van driven by that same driver while the same cousin lived there, and Olivia's older sister would probably have been about the same age. Those times, nothing more noteworthy than picking up or dropping off some random item occurred. It might have been cookies or conduit. I couldn't even tell you what year it was.
But I'm sure that day is etched in the memories of all the survivors. In a brief moment, a day that could have been as mundane as all the others turned into a terrible day that won't be forgotten.