The ray of light peeking through the crack creates a blinding effect on the subject. The light is so bright that it blinds her vision, covering her eyes in the photo. The black and white filter makes the ray of light even more bright.
LOVE the permeance of sunlight in this shot, but by the same token the room seems to suck it all up and not let go! Notice how the room is still dark? (kind of reminds of Austin in a couple ways) "in the glow of morning light"