Suing a high school girl--or her limits--is unlikely to yield a lot of money, even if you bankrupt her whole family.

Suing the insurance company of the girl--they're probably very well insulated.

Suing the truck driver who was behind her...might be hard to find him/her? of course it's not the high school girls fault, how could she have known to adjust her mirror when the lights from behind were blinding her?

Suing Isuzu is the quickest, easiest route to cash.

I echo the above comments on where the two boys were parked, or the girl was driving, on the road. Lots of questions, but I'd have to see more info before passing judgment, however.