The sister has more chapters, and I do not remember as much (mother only has PoV chapter, father has 2) But, she fortunately was never malicious, or directly harmed anyone (there was side harm from people reacting to her moods and actions) and never really realized what was happening, she was spoiled but not do what I say or else spoiled, or that people were being replaced (I think it even said she forgot she had a sister) it seems like after it is revealed she is not the miko, she loses her support network, but gets taken in (under the protection?) of one princess and starts trying to correct her ways and mend some of the damage she caused.