I hope you get some clarification from the teacher. Zero does seem pretty extreme, so hopefully there is some kind of explanation. I feel bad for your DD too, though, regardless.
BTW, I can't imagine that a time-traveling piano story would not be science fiction-y enough, unless the teacher was looking for some more specific elements in the story (that were explicitly stated in the assignment, of course). Regardless, that story sounds pretty cool and interesting, and maybe your DD should start her own writing journal outside of school to explore her interest in writing. As you are probably aware, there are a gazillion stories of now-famous writers whose work was criticized by uninformed teachers or reviewers early in their career, so I hope your DD isn't discouraged by this from pursuing writing if she enjoys it. Good luck
