I'm going to go with a buckskin. I think that she will shed her foal coat and she won't have as prominent of a dorsal stripe and I think if she does it will be from countershading, because she doesn't show any other signs of being a dun. She's gorgeous, though, nonetheless. Also, the mare is in good shape after having the foal.
Eye colour really can change a lot from foaling, and most baby animals have blue or grey eyes at birth - including humans :)
I think she is a bucky. She could be dun as well, or just dun. I am not really great with foal colours lol. Her dorsal could be foal shading, but it looks quite distinct to me. Again, not good with foals, so might be wrong on that lol.