Is expiation required of one who caused her sister's death during a Ruqyah session, after she was overcome by jinn possession and beat her, leading to her death?

If a woman afflicted by possession or sorcery kills someone, and her action was beyond her control, then she is considered like an insane person, in terms of the lifting of sin from her.

As for what entails from the killing regarding expiation and blood money: Expiation: It is obligatory for her to offer expiation according to the majority of jurists, even if she is insane, because expiation is a financial right that becomes obligatory upon her wealth. Blood money: The blood money is upon the 'Aqilah (the killer's male relatives on the paternal side). The intentional act of a child, an insane person, or a mentally deficient person is treated as an unintentional act regarding the obligation of blood money upon the 'Aqilah, and there is no retaliation for it, because they are not considered to have proper intent.