She's not a big actor at all, but she was in the movie Jason X, and this scene in particular stood out. Jump to 0:40 secs and 0:43 seconds. Both happen pretty fast. It's probably worth getting a digital copy and playing it at 1/4 speed.
https://www.youtube.com/watch?v=m-5pPy7zuyc
the part where she's sitting in the background too:
(http://images6.fanpop.com/image/photos/40600000/Jason-X-a-nightmare-on-elm-street-vs-friday-the-13th-40611006-500-281.gif)
28:55 of the full movie has a really nice shot of her spine. I can't screenshot due to youtube.
1:24:11 has a really nice shot of Lexa Doig's spine