Odd does not equal evil or demonic. Again, where is the evil in this story? I believe I have read you relate the story a time before (I could certainly be mistaken about that), and was puzzled then by its use in supporting the existence of the devil.
Ouija boards predict nothing...feelings, inherent knowledge, opinions, predictions (ours) may come out...I had a blast mant years ago with an Ouija board...there was a girl that everyone...I mean everyone knew as Sue....I somehow, knew that her real name was Marilyn....at a stupid teenage party we played with the Ouija board and I revealed that "Marilyn" would do something that I knew "sue" was going to do...after the event, the participants discovered that Sue was really Marilyn....they were all amazed and I never revealed the answer....that was 50 years ago