The Reborn Daughter Is as Beautiful as a Picture

The heroine is quite stupid. To be honest, after rebirth, she clearly has the backing of the princess mother and the emperor, why not use it? He openly let the mistress, mother and daughter into the house, helped them enter the family tree, and so on. Even if her mother can't live without her father, can't she use the power of the Princess Palace to find out the truth about the mistress and then force her mother to divorce and let the scumbag father cleanse himself and leave the house? I really can't bear to watch it anymore. It would be faster to say goodbye outside the house or take revenge.