I have seen this same 'apparition' several times in different photos throughout the internet.
I would even hazard a guess that appears to be a photoshop creation although I'm no expert in that field.
If you visit ghoststudy.com, you will see how the have actually purchased the rights to the famous 'ghost girl' photoshop that has been encircling
the web for many years now.
They use her in several different photos now for amusement only rather than alot of the bogus attempts they have recieved from viewers to pass off as
real.
The site you posted is interesting, but I wish they gave some detail regarding each photo they list.