She needs to:
- Have had at least 1 H interaction with MC
- Have low grades OR high affection with MC (something like 40)
The easiest way to get that scene is during the week after the first weekly exam event. Just give her the grade 0, have her H event play out and don't bump up her grades after. Then, the following week, you need to call her to the office and ask for a favor exchange. If that week passes, however, she will take another exam and it will most likely bring her grades back to a very high score.