1) She is not grulla because neither of her parents are dun. She also looks absolutely nothing like a grulla.
2) She is not a roan because their of her parents are a roan.
With her parents what they are, she has to options of being black, bay, chestnut, or brown. She is obviously not a chestnut, so that's out. I would also rule out bay, which leaves black or brown.
After looking at the pictures again, I would say she's just a very sunfaded black. If she were brown, the lighter points would be in "softer" areas like the elbow and flank. However, they are in spots that get hit with direct sunlight, particularly her shoulder and hip.
The dorsal stripe is countershading. It's like when you take a marker and color over a spot twice. It gets darker. Same concept. As in two sides of the horse's color are overlapping. It makes sort of stripe, but not a true dorsal stripe.
Last edited by Poseidon; 09-24-2011 at 01:30 AM.