Its "kind of" confirmed to be a super power later on when she meets someone else who also can see ghosts.
So far we have yet to see a happy spirit other then the woman.
usually ghosts who stick around are those with lingering atatchments so it's plausible.
we actually see what "might be" a god and what "could be" a portal to hell/ heaven later on.
but its hard to confirm when all the MC wants to do is ignore it and run away
