Nobody's trustworthy in this house. The mother and/or the daughter could have poisoned her to get her part of the inheritance, how the mother quickly changed her mind about taking care of her after hearing the cost shows that she values money way more than her daughter. As for Cinderella, she sounds too good to be true, she could be one of those characters that looks angelic in the eyes of others but is in reality the more evil. After all, like MC said, how can she smile brightly when her inheritance is stolen from her ? Unless she's the dumbest girl alive.