Is a girl entitled to hold her mother accountable if she saw her in an inappropriate situation with a strange man?

What the mother is doing is a great evil and a type of illicit intimacy (mukhadanah) forbidden by Islamic law. The questioner must be patient, pray for her mother's guidance, and treat her kindly. She should not confront her with the sin directly, but rather advise her through indirect and gentle means, such as encouraging her to do good deeds, reminding her of death and the horrors of the grave, and seeking help from righteous people to mend her relationship with her husband or encourage her to marry. At the same time, she must ensure that this relative is prevented from entering the house or being alone with her.