Reflectors aren't much protection at the best of times, and certainly not intended to protect you from an overtaking motorist at 80 or 100 km (50-60 mph) on a night-time highway. A thorough investigation and 26 page report didn't lead to charges. Note that the suit by the parents against the driver accuses her of "speeding, under the influence or texting". Why did they use the word "or"? Because they have no idea if any of that is true and are fishing for something to blame her with.