She probably deserved it.
I suppose she's entitled, but it honestly seems like a cunt thing to do. In effect, she's basically dragging the kid's rents through the court. Why not sue AMTRAK or the city which operates the train station? Not only would it be less heartless, but they're both highly insured for such things, making it a much better endeavor.
Although the likelihood, this being 'Merika and all, is that she's suing all of them, plus the conductor, the state and federal governments, the ambulance driver, hospital and doctors involved in her treatment, and anybody else tangentially involved in the situation, for lots of pain and suffering and emotional distress. Still, with lots of insurance companies settling out of court, it still seems kind of uncool to sue the kids folks.