I read the raw and roughly grasped that Princess
TLDR: MC's life is not going to be easy even after she gets rid of her evil sister and mother.
is a harder opponent for MC to fight. She even sends rapists to rape her, and frame her by ordering a random servant to put poison into the medicine that MC was cooking to ruin her reputation as a doctor and still able to get away from those crimes. Even Male Lead can't do a single shit on her. Things getting even hectic when ML has to deal with other princes is who actively plotting against him too.
TLDR: MC's life is not going to be easy even after she gets rid of her evil sister and mother.