Now that I have seen her legs, I am happy to say chestnut roan. You could say liver chestnut if you wanted, but liver is just a shade of chestnut and not a colour on it's own, so I won't use the term. The reason I am convinced that she is chestnut and not black roan is because of her lower legs. A black roan may fade in the mane and face and present as your mare's colouring, however, their lower legs will almost always remain black. Your mare's lower legs pale a lot to a gingery colour, a clear indicator of a chestnut base.
She's quite similar to my pony actually, just a darker base coat. My pony is a red roan with a flaxen mane and tail. While she's lighter overall, you can see in the photo below that she shares many of the same features. Her legs get darker before lightening up right around her coronets, and she's got black, silver, red, etc mixed into her flaxen tail.
Just a few of some of the awesome characteristics our lovely red roans are capable of!