My version:

Reference images:

Analysis (whoo, scientific): I don't know if this even counts as a hairstyle, probably not. I find it rather amusing that, even with this lady about to die and giving birth, they still had to undo her hair! The hair is parted in the front, then the sides are pulled back slightly, with no fasteners visible.

Directions: Part the hair and pull the sides back, pinning or clipping to hold. Her hair is neither curly nor straight here, instead being rather wavy. That's it!