i feel like at the beginning her father did love her because when he told her off when she was little he had a regretful face when he turned around. im guessing the reason he behaved like that is because the king has her in the palm of his hand so her father didn't want her to be open to danger. then when she came to the shadow room I think the knife was supposed to be used to defend herself or something, and the prince was actually sent to rescue her which is why he shouted no or stop or whatever when she was about to kill herself
anyway this story is really good and the art is AMAZING. Thanks for the fast translations :)