Most foals will have what looks like primitive markings (dorsal stripe, etc.), it's usually temporary and will go away (or stay as counter shading) when they shed their foal coat. She is definitely not a grulla (and FYI all grulla/grullo's have dun factor, they have to since grulla is just black w/ dun). My vote is dun, could be buckskin, but I'm going w/ dun. She's adorable!