The final solution to this matter: first, strictly limit your mother's freedom, but treat it separately from the legal restrictions on personal freedom; Second, call the police after you get relevant information from your mother. It is estimated that 1 10 is generally not responsible. You can report the situation to the relevant local departments.
Judging from what you said, your mother was deeply fascinated. Simple preaching will certainly not solve the problem, and it is difficult to change the concept.