Yes, it was just Jessi moving her head.

The amount of motion you get depends on the hair settings. Kirwyn's Genesis hair (available free at the link I posted) is pretty good for a lot of motion.  It also is a tutorial of sorts, with lots of great tips for using dynamic hair.

Here's SP3 with the same hair:

http://mysite.verizon.net/vze78spq/genesis.gif

In that one, I added a wind force to get her hair to move more.