Truthfully, she's just a spoiled girl that didn't know any better. Once she mellowed out, she became adorably smug with every accomplishment. She underwent proper character growth and as a result, became a better person because of it. So, you are correct. The hate is unjustified.
bruh y do people hate the demon kid so much. She's a princess who's like 12 and pretty powerful. werent we all little shits as preteens?