Ok i'm dropping this. I know that there was a child born to be favored and the fl is the one. To be honest that's why she so nice she got good environment everybody love her and that's not her fault but this is why she can't understand her sister situation clearly. It seemed that she also afraid her sister to summon the basilisk again more than her sister truly happiness otherwise she would gladly to let duke take the lil one look the duke was the one who truly care and what's he said was true. There a scene that look like she know that the 1st princess abused her sister and there was then she mentioned that she was ignored all the time also the reacted of her father all this matters to let go of the child. lol idk i wish she realized asap before what she was fear happen again