Did she write this, or say it?
If she said it. And you wrote it, with a "?". Then that would be the problem.
As in...
"OK. Write in the box, 'why it is not a percentage.'"
Thats just saying to do something, to me.
No she wrote it on the board too, and she intended it to be a question. Like I would say to you: 'Why it is blue?' I mean that I am asking you actually why that thing is blue.
Sorry, I'm rubbish at explaining things LOL.