I dont know why the story goes like this.
I feel everything would be better.
make her a master mind. Who cross the rebels and show the whole demotion front of everybody is a farce to make them active towards her. Hell even killing a dragon is ok. Saying she still hurt by the class system and thats how she show it.
or just make her into a full rebel not backing down. That would be cooler. Hell i would give her a w against her sister to show how bs is the class system!