She looks like a rocky mountain horse to me, so I would go with silver, also known as chocolate or taffy. That's just based on the body hair, legs, and the sootyness in the mane. Surely she isn't that breed but that coloring is possible in a pony.
Shetlands have the silver gene, same as the RMH. The mane and tail are usually more silvery with black roots, and less orangey than in a liver chestnut with flaxen, but it can be hard to tell without a dna test.
Silver gene on black base can be dark chocolate with a white mane and tail, very striking.
I now have a bias against silver gene because a pony I had went blind due to it. Eye anomalies are associated with it especially if homozygous.
I'm really not seeing silver at all. Just chestnut. She's on the darker side (though personally wouldn't classify her as liver, not dark enough) with a flaxen mane and tail. It's not at all uncommon, and while silver is possible as it's found in many pony breeds, it's also unlikely.