How should one deal with a mother suffering from a mental illness who accuses her son of witchcraft and rejects everything he offers her, taking into account the Islamic legal rulings?

A mother usually has compassion for her child and does not accuse them, and her behavior might be a result of her psychological illness. It is advised to be patient with her, supplicate for her healing, and seek treatment for her from specialists, while focusing on ruqyah al-shar'iyyah (Islamic exorcism). If the mother refuses your help, it can be offered to her through others. Care must be taken to show filial piety to her, for good treatment is a right of the parent, even if they behave badly.