My theory is that the manhua that she read was in the perspective of the heroine as most manhuas do so since she's supposed to be the bad guy there she was described as one and the sister might have been really vicious from the beginning as she tried to humiliate her self and look pitiful at the dance making it look like the princess pushed her (like another Mielle or something)
As for the father, the current Abella said that even in the manhua he loved his daughter and never once resented her even at his death. He might have always treated her like this but was never put into light since the manhua wasn't abt her. Her attitude and resentment towards herself plus the mind poisoning of the nobles didn't really do any good for their father-daughter relationship to develop much much nicer like what was currently happening (￣∇￣")
Ohh that’s also another possibility (☞ ° ʖ °)☞ omg this story has so many possible theories I don’t know what is what ehh ¯_(ツ)_/¯
I don't think the father was reincarnated but for sure that purple sh!t is
This is just a theory but could it be that both the father and the first princess(don’t remember their names yet) are also reincarnated? That’s why the first princess try to act all innocent and cry on purpose because she thinks everything will be the same again? And the father started to be nicer to Abella because he wants to fix his mistakes? Honestly idk but I hope we get an update soon ♡´･ᴗ･`♡