This shit right here is part of what rubs me weird from Japanese normative high-school culture. You as yourself are an individual, but you as an individual are part of the collective of the classroom your in, so you're expected to put-in the same amount of work, effort, and inclusiveness as everyone else in the classroom because as part of the classroom you're basically a face for your classroom, your merits or failures are not your own but your class' also individuality or circumstances be damn.
You can be the top score of the classroom, or the the top score of the grade or the top score in the entire school, the recognition is not only yours, but from classmates, teachers, and people that may or may NOT be involved with you AT ALL, because you as an individual are part of that school.
So in this case Ruri, the reserved girl managed to develop into an outstanding dragon girl which felt pushed on by the "collective" into moving a freaking TYPHOON out of the way so the Sports Day could happen, feel all the scope of the attention she would get, suddenly awaken another much attention-capturing "power" and all she could think is "how this could make my classmates feel weird about this"? Girl you're the most unique individual at the moment, don't get caught on what if my peers would think you're on FREAKING FIRE LITERALLY.