Wait, that's it? She was a bit rude and aloof? And she came around on it already, simply after learning about people in her vicinity disliking that about her for the first time?
I think she was very much right when she went "Why, I wonder, did no one ever inform me?", because it looks like her issue was miscommunication rather than her personality all along. Like, she explicitly cares about the feelings of others, who, judging from that one courtier's comment ("Please just spare my life!") presumably just put on a mask around her 24/7 and pretended everything was fine, fearing retaliation from the royal family in case that they didn't play their part.
And that's what counts as "a prideful and spoiled princess, known for her arrogance and lack of charm, making her widely disliked"?