I can tell you what happened with one of my BPs, that was similar.
A few months ago, Ashes had a complete shed. With one problem; two of the tiny brown scales on the top of his head, came off with the shed. The area underneath was white for awhile and then gradually darkened and now you cannot even tell there was anything wrong. I think that, like in your case, there was a layer of skin still there, and bone was definately not exposed. Now if you look at him, it seems the scales have grown back; they are the same color as the other head scales.
Hope your little girl there grows back her scales.