I would call her a Noppera-bō, a harmless spirit that only minds its business.
But that’s wrong.
You’ll know when you’ve lied about what you’ve done.
You’ll know if you stay hidden behind the bleachers.
You’ll know when she catches your eyes in the bleachers.
So hold your tongue.
Never let her overhear words that contradict the truth, even if you think it's the truth, because she gets angered by lies.
You'll start to feel her presence, short brown hair in the corner of your eye.