Spooky! I have heard people talk about seeing ghosts but I don't think I have or maybe I have and pretend not to have seen it. 😆 I always do that when I see weird things!
Do I believe in ghosts? Yes, they exist.
Your daughter is brave and her brain probably dealt with the unexpected sight like trauma by hiding the memory away.
She is currently living on her own in at the Uni - she doesn't have a roommate yet
Good thing she doesn't remember things like this ;p