How To Treat Paranormal Experiences In Children?

My15 year old grandaughter told her mother last night that for a long time she has seen the figure of a small boy in her bedroom at night. She had mentioned that to her parents about 7 years ago, and she didn't talk about it since then. But recently she says she has seen her girlfriends dead sister on the school bus. That she sits with her sister and looks right at her. But she has become frightened in the last month or so by a figure of a large man at the foot of her bed. She said he is angry and it scares her. Last night he touched her on the shoulder when she turned away from him. She has been trying to ignore these sightings for awhile but now this has her more frightened and she has had trouble sleeping. We all had no idea that she was keeping this kind of things from us. She has asked several times in the last couple of months to go to church. They used to go every week. She has also been sleeping with her tv on at night, she said she liked the light from it. I guess a few nights ago she left her bedroom light on all night and her mother wondered why. This child is not ill, she is a very talented athlete a straight A student and very popular among her piers. We have never seen anything that would make us believe that she doesn't totally believe this is what she is seeing. These beings never speak to her, sometimes they smile. She said they don't have bodies but appear as a light but she seems to know what sex they are and about how old they are. What should we do for her.