>>41455212 (OP)
Ask her who/what came up out of the ground to rebuke King Saul if it wasn't the ghost of Samuel.
I once had this discussion with someone, and he said, "Oh it was a demon!" To which I responded, "So then why doesn't the Old Testament say that a demon masquerading as Samuel came up out of the ground?"
If it was actually a demon, then the Bible itself is wrong. If it was not a demon, then it was in fact the spirit of Samuel. And what is a spirit of a human being that is not in the afterlife but is present on Earth? Ask your question friend that.
1st book of Samuel, chapter 28. Picrel.