I also find it troubling when people talk in breezy terms about mental illness. It is something that affects families and relationships very deeply and should be taken seriously and treated sensitively.
It is 100% true that many people who are not mentally ill fall for conspiracy theory lies and the like. But that doesn’t mean this can’t be or isn’t a symptom of a change in your sister. You were concerned enough to post here—I would trust your instincts. Part of you knows this isn’t right, because you know your sister. I would talk to her and see if she is willing to get some help.
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