WSA - she looks red dun. She has the apricot tone of a red dun foal, as well as the dorsal that clearly runs into her tail. As well as this, she also has some pretty easy to see ear tipping, another dun factor trait, and I think I can also see some faint leg barring in the shot where you can see her legs.
However, that is just a guess based entirely on the phenotype of the foal. Until I know the colours of both parents, I would not be willing to say I was 100% certain. She could just be a chestnut foal with heavy foal camouflage.