T.M.
She probably does believe it's true, but that doesn't mean you have to believe it. I do think you need to be supportive of her though. Don't make her feel as if she's done something wrong or is being crazy. Every person is different and that's okay. As long as it's not disrupting her day-to-day life or some how negatively effecting her life then I would not take her to a doctor or psychologist. Also, as long as she's watching age-appropriate paranormal stuff then I would let her continue to do that too. Maybe it is just a phase and so be supportive and love her.
Good luck!