She looks like a dark silver. I have 2 in the color that are shown in the last pic. I don't have birth shots of the one mare - just ones where she is similar in age to yours.
But the other one looked like this in 2010 as a foal -
Like this when clipped -
Then like this as a yearling in 2011.
All the above photos taken by Ferin Mershon.
Then she looks like this now - with me. This one in 2013 in summer coat -not clipped out.
and like this in the spring in winter coat.
This color is known as silver black. The dam of the above filly is a silver bay (solid) and her sire is black frame overo.
The dam of that filly (yours?) in the 1st photo looks like a black tobiano pinto, so the sire must have a silver gene. He is either a silver black, a silver bay or a chestnut carrying a silver gene that doesn't show on "red".
Dam has a spot of white at the withers, tail head and socks. Sire is a red bright chestnut with flaxen mane/tail. Not at all like how my gelding is, dark chestnut. No clue about grandparent colors.
sire could also be a silver bay. Many silver bays "look" like a chestnut and many folk have a hard time telling the difference. Indeed, on some it can be difficult...
Congratulations on the new filly!! More pics of course once you have her home.
Yes, of course I'll post tons of pictures once she gets home. Been fixing up the easement pasture and putting up a shelter. Kasia is moving in with her so the little baby will feel more comfortable and less nutty about finding a way out.