Sometimes the spirit being channeled doesn't have good intentions, or is just mischevious. That being said, I can't tell if she is channeling or not, I also haven't learned how to access past information about our world in any means that would allow me to verify this story. You know, many spiritual stories don't seem very real, they seem ficticious or fake. Maybe only make any sense to few...
Although it is true that insanity is also an issue sometimes. It would just be easier to decide after meeting this person face to face. At the very least it would be possible to drive out a mischevious entity. If nothing like that was present it might very well be fraud or delusion.