What is the ruling on dealing with a mentally ill mother who commits grave sins, does not respond to advice, believes in black magic, while her children fear her harm and wish to prevent her from this path to avoid scandal?

Sorcery and adultery are among the greatest major sins. The woman's sons and daughters must advise and warn her about the consequences of these actions. Sorcery is forbidden and, by scholarly consensus, is a major sin; it can even amount to disbelief (kufr), and the punishment for the sorcerer is execution. As for adultery, its perpetrator is punished with one hundred lashes for the unmarried, and with stoning to death for the married. One must continue to advise the woman and alert the father to his responsibility.