which reindeer ran over grandma

Hmm, well, I suppose it's hard to say for certain which reindeer ran over grandma, as they all have the same ability to fly and travel great distances. However, if I had to take a guess, it might have been Dasher or Dancer, as they are known for their speed and agility. Or perhaps it was Prancer or Vixen, who are known for their graceful movements. It's also possible that it was one of the other reindeer, like Blitzen or Comet. But again, I can't say for certain.