Has anyone out there ever struggled with spiritual warfare and how it relates to psychosis or mental illness?

I have a member of my family who was a firm believer in the Bible and then was "overtaken" very suddenly with an altered state of reality. She watched the movie "The Ring" and in one week was rendered mentally incapable of going back to school. She was disoriented to the point where she confused night with day, what color her eyes or skin were, even had to be told repeatedly what her name was. Previously she had been an A' student in high school. Any thoughts or comments from anyone?