This is not a multiple exposure or photoshop trickery. Nor is it a photograph or picture physically pasted onto the mirror glass. And its not somebody peeping through from the other side either.
Very strange, the woman had to be close to create a reflection of this dimension!
Had she been that close to the mirror she would have caught the light! Can't figure it Dave :-) Ghosts don't come that attractive anyway!
Love the lighting and simplicity of the shot.