I agree with CheyAut.
You can see that the mane is greyish, as well as parts around her eyes and mouth.
I can't see the picture overly well, but that'd be my guess.
And if she doesn't grey (which I doubt, but ya know) she'd probably be a light bay (I wouldn't bet on that though). If you don't look at the signs for greying, then you can look at the legs, which are black I think, can't tell for sure from the picture. And most bays end up with counter shading you see as her "dorsal".
I would definitely say she's going to grey out though, I don't see any dun either..
I agree she's almost definitely going to grey, but as for her "actual" color I do not see dun - almost all bays have a very narrow dorsel stripe and many buckskins as well. It would be easier to tell if we knew her parents colors because at this point it's virtually impossible - you can tell by her legs and her lower body though what her "actual" color is going to be. All that pale dun colored baby poof is just shedding foal coat and has nothing to do with her actual color.
And her mane is a dead giveaway that unless she's silver bay, she's definitely greying out.