What is the religion's view on demanding that my sister swear on the noble Mushaf to prove her innocence of an accusation of sorcery, based on what a diviner claimed to my brother's wife?

A woman's going to a diviner is a great evil and a major sin, because the Prophet, peace and blessings be upon him, said: "Whoever goes to a diviner or a soothsayer and believes what he says has disbelieved in what was revealed to Muhammad." This woman believed the diviner and acted according to his words, and based on that, she accused another woman. The words of a diviner do not establish a legal ruling, and nothing should be built upon them; rather, it is obligatory to disbelieve them. Therefore, Allah entrusted her to him when she believed him, so she was afflicted with illness, worry, and sorrow, in confirmation of the Prophet's saying, peace and blessings be upon him: "Whoever ties himself to something will be entrusted to it." Thus, the woman must repent to Allah for her action and for accusing her Muslim sister, as accusations are only proven by legitimate evidence. If she is afflicted with an illness, she must seek lawful medicine and healing.