Being a head is basically a sphere try adding a 3D sphere layer that you wrap her image onto. Then animate that sphere to match the body movement.
I'm not sure about the white. Also if you don't want to go the 3D route as JJMack suggested, and just want to rotate the head, you need to put it into a smart object then key frame the rotating by using transformation.
JJ -- I found this tutorial to do it- maybe...
but I dont see in my cs6 3d mac menu
Step 3 - Making a sphere
Now go to the new menu drop-down called "3D". Select "New Shape from Layer" and choose "Spherical Panorama". Your panorama will now become a 3D space with the photo surrounding the viewer.
I followed another tutorial https://www.youtube.com/watch?v=gtGxZ19yyp0
I do not do 3d stuff but that tutorial may have been written for an older version of Photoshop. Since then menu item wording may have changed. See if the screen capture help you locate what your looking for. However putting your image inside a sphere will not help you. You want the head on the outside. Experiment with the size of the background area about the portrait keep the aspect ratio 2:1 for the sphere but change the size so you get a good wrap with little distortion. View screen captures in new tab or window so you can zoom them. This site image scaling is awful...
If you have many images of her head here is a tutorial on creating a head texture Photoshop - Head Texture Creation Tutorial - YouTube