She's back! Now in under 12,000 triangles!
I also noodled with her face a bit more since last time:
I was more interested in getting the model to look like the high res version than I was making it as low res as possible... so I tried to maker her as expensive as I was allowed (which, in this case, was 12,000 triangles and three 2048 texture maps). Very satisfied.
Now it's time to rig and animate her!