It sounds as if all she is going to get is a "slap on the wrist".....
I missed that! That's a horse of a different color; he's probably an insured driver and, when this case gets to court, will be the nearest "deep pockets" for the lawyers to go after. And he wasn't wearing a seat belt. The fact that he was, at his age, participating in a joyride with a 12-year-old . . . he's the worst-injured of the five, but he is as responsible as anyone for his own injuries.
18 vs. 12 . . . bears comparison to a statutory rape situation. Any responsible adult would have grabbed the keys and prevented the accident in the first place.