spooky. i don't do ghosts and stuff but as a child i saw things. not people, beings (well, demons. and i never wanted to talk to them). what bothered me was if i opened my eyes they were still there. and i had out of body experiences before sleep until i was in my thirties.
i'm not comfortable with 'girl'. could your daughter have noticed a film you didn't know she was watching - for example, when she was a baby and you were holding her, with a film on television in the background? that might have been stored away in her memory. i'd get a vicar round, but i'm easily spooked.
my mum used to say that children are going to be scared so you tell them about the bogeyman to save them from having to invent something more frightening.
imaginary friends, generally, are nothing to worry about. the clinical psychotherapist (no i'm not mentally ill, i work in an abusive environment) didn't like mine. but asperger women often have whole kingdoms of imaginary friends.
i must have mentioned before, a colleague told me that her neice was looking through an old photo album and called out 'oh, that's the man!'
'what man?' asked her dear family, staring at the picture of the grandfather who died decades before she was born.
'the man who reads me stories at bedtime! he makes funny voices and all the sounds...'
colleague's dad died young. he had read stories to his own three children, using funny voices and making all the sound effects...
colleague's brother took to reading his daughter bedtime stories after that...