For people not getting why she is evil. She never was, but because she had class she seemed cold to others and they compared to her dimwitted sister. That along with her having destruction magic, the citizens and young nobles just could take that she was more dignified than them.
Later they're going to regret it, her sister's best friend leaves her sister's more or less a giant hypocrite. She ruins the charity event(obviously) by not having enough food, and most of the food being spoiled. And keeps expensive gifts she's gotten from noble men.