One Spotted Walker breeder I know always said you know it is a grey when the new born foals are black as velvet. You know it is a black, when it is dark grey or brown. Weird, but true. All of that breeders grey babies started black as black could be, but they never stayed black.
I will put one vote down for grey.
My wild card would have been black champagne, but taking a second look at her, probably not. She's already to steel grey to really have any cream or champagne in her. She would have stayed a mousey brown/grey if she did.
Think of it not as a failure but as a success in how not to do it.
Don't look in a horses mouth for a gift.