In the moment, with everyone and everthing going on around her, I doubt she was thinking rationally or even knew that torching a car would be a long prison sentence. (if someone asked me before reading this article, I would have assumed a large fine + some community service maybe; then again I am not American so I have no idea how sentences compare).
I don't live in the US but I know someone who spray painted trains at night for a few year. That eventually did cost him a decent car. Obviously not as much as he caused damage over the years but enough to make some teens think twice whether a nice car or temporary colored train are their short term goals.