To me, the most notable part of this article is the parents' immediate assumption that the ghostly figure is the Virgin Mary. Clearly it could be anyone, male or female. I can't help thinking of those near-death experiences in which the Being of Light is identified by the NDEr as Jesus, even though the Being could be anyone, or anything, at all.
From my point of view, which is mostly in line with spiritualism, the figure (if it is legitimately paranormal and not a hoax or a photographic glitch) is mostly likely to be a spirit guide of some kind. But it could also be interpreted as an objectification of an "imaginary friend" generated by the child's mind ...
The Virgin Mary is not the first thing I'd think of, but that's just because I have a different belief system.