I remember that I got the spinning girl to go c-clockwise once before and I did it again by looking (or not directly) at her using the corner of my eye. Looking at the shadow does nothing for me.
If the shadow way doesn't work, try this way. It may take some time to work it out, but when you have it right, the brain will do the rest. Then when you look at her normally she go back to a clockwise spin.