Depending on where you live or the type of injury, driving to the hospital can be the smarter choice. If you have a massive internal hemorrhage, there's little to nothing an EMT can do, so all the time they took to get to you is just wasted minutes when seconds matter. The only thing that can help you at that point is getting into an OR as quickly as possible. If you can drive there faster, then it's the smart choice.

Average time in the US for ambulance arrival is eight minutes. This girl probably got hit in a major abdominal artery, which means she had maybe ten minutes before she was dead. The only chance she had would have been for the mother to open her up and clamp the artery, which was pretty obviously not going to happen.