Does she ever say why she was there?
I Don't Think It Was Mentioned...Maybe Skipping Class To Go To The Mall ??? Lol :)
Your guess is correct! She cut class to go shopping.It is mentioned. She talks about it with her father in the car when he drops her off for detention at the very beginning of the movie.
At the beginning, the father mentions, "Ditching class to go shopping."
Ditched class to go shopping, her father says it in the car at the beginning.