Remember when we all had the horse color discussions? Do you think Biscuit looks like a "smooty" buckskin? She is getting so light around the eyes and muzzle. Her sire and grandsire are buckskins, and she does have a dorsal stripe. It was November when we got her, so who knows what she is shedding out to be.
Seems like I remember that they said a buckskin was just a dilute bay, so she may have a recessive dilute gene, but she looked like a dark bay to me in the last picture you posted of her. Could you post it again?
What I'm being told in genetics is that a dorsal stripe means a dun, not a buckskin. However, if she's shedding out light on her muzzle, and she has black points, legs, mane and tail it sure sounds like it doesn't it?
In the picture she looks like a dark bay or a brown. UC Davis will do color testing on horses - I've thought about having one or two of mine tested. Then I think, just where am I going to get the dollars for this :)