From a personal experience, when I was about 13 or so, my mom struck a boy who ran out in front of her while I was in the car with her. She was only going 20 mph, the boy was banged up a bit, but was ok. (Thank God) My mother had the most difficult time after that. It took her many months before she got behind the wheel of a car again, and when she did, she was a nervous wreck. It's something that crosses my mind from time to time as a flashback too when I come across kids on the street.
I feel so deeply sorry for the driver. For the family & for everyone who was a part of that experience today. It was tragic & quite honestly, (IMO) no one is at fault, it was an accident. And accidents happen. It's really upsetting.