honestly the MC is hateful. I get the thing about protecting your brother, I would do the same but the brother never came clean to her about anything. She even asked him once what happened with the prince and he didn't answer yet she demonizes the prince and acts this way. I'm not saying she should jump into the prince's embrace and be in love with him, just because he loves her doesn't mean she needs to love him back but her attitude is too much. Also, she has the whole holier than thou attitude yet she didn't mind at all when her father suggested they kill an innocent child who claims to be her father's bastard child, she agreed to this knowing the child was being used and all.
I don't think the choice to kill the child is necessarily the worst thing ever especially if the child is used to not only destroy the duke's family but probably wreck havoc on the entire territory. However, someone who is ready to bloody their hands with children's blood has no business claiming that another person is evil especially since that person, at least, isn't known for killing kids. She made the conscious choice that (1 kid < her family + territory ) and her father is just a duke yet she can't understand that the stakes are higher for a prince ? (her family + territory <<<< the prince's royal family + the entire kingdom) so she can't understand that much ? She can't grasp the fact that it is possible that the prince does seemingly evil things for the greater good ? Weird coming from someone who does th esame thing on a lower scale.
I think I just might dop this because the MC is horrible. I can stand a bad ML because the MC appears more and the focus is on her but if the ML is good but the MC is shit then there's no saving the story