Ghost in Front of Window

This was taken at my boyfriend's apartment. Neither him or I took the picture, so I think it was my 7 yr. old daughter who took it. The window in the picture is facing the north so it is not the sun. I am not sure what it is but I have NEVER had anything like this in any pictures before. Please let me know what you think.
Thanks, Kami Kinzebach- Rockford, Illinois