Psyche knows the prince is bad, previous chapter it shows the prince blackmailing her.
But Medea.. She has it hard... That duke of father, not only incompetent but evil
Seriously, duke.. Thats way faster to make her say annul it..
He didnt even bother to warn the servants of the house how important she is.. And let alone welcoming her..
Hari despite how she said she dont like her brothers etc, she cares, and for that cares, she dont want to burden Eugene with the information. And i think despite Eugene treating her part of the family, she still feel as a stranger.