Also stuck here, tried closet first, obviously didn't work. Tried jumping her sight with the box, couldn't seem to time it, her gaze stays there too long. And tried using the box to block the door or the closet with me in it, neither worked.
You have to push the crate under the big crack in the wall where the light comes in from the corridor. Then jump and by pressing up you can crawl through the crack. If you are using the latest version there should be a little green arrow indicating this.
Didn't see the arrow, so must not be latest I guess, but I did try jumping there, just didn't think to press up, thanks. Finished it now and keep up the good work with it!
