With the darkening on her face, I'd say she's either bay dun, brown dun, or has sooty. She has a dorsal, but the light is reflecting off it in both pictures that show it, so it could be countershading.
I'm leaning towards brown for her base color, largely because she appears so much darker in the first photo, and browns tend to vary in color like that throughout the year. It could just be an effect of the lighting, though.
I'd believe the roan, but it can be hard to photograph well unless they're VERY roan.