Is the woman who mistreated her father, who had committed fornication with her when she was young, sinful?

The father committed a grave sin by assaulting his daughter's honor. This is proof of his lack of chivalry and the perversion of his innate nature. It is not permissible to mistreat him or deal with him in an unfitting manner. Since the incident happened a long time ago, he may have repented and regretted his actions; otherwise, he must be advised to repent to Allah, while concealing his sin, honoring him, and treating him kindly. Also, avoid being alone with him and anything that might provoke him.