Ghost my arse!
Er... When you refer to the ghost spotter as a 'medium' do you mean she's of medium intellect??
"But what is really strange is that she doesn't appear as a full figure - you can't see all of her."
Or, the picture-knitting on the first photo has distorted the lower half of her body (but it's still there, look!!) and, on the second pic, she's stood behind a bollard!
Christ on a bike, this medium almost makes Derek Acora look believable (and he's a TWAT!!).
Alien, 'cos they're even more believable than Derek (and ghosts).