Seal brown is basically another way of saying dark bay.
| Seal Bay (At): Seal Bays or Browns are very dark and generally have a black, or nearly black, body with red or tan around the nose, eyes, and flanks. Seal bay is controversial, with some arguing that it is actually bay + sooty. At present, Pet DNA Services of AZ offers a test for (At) but because they have not published their research, there is still some debate. |
^Taken from the equine-color.info website.
So basically she's both. :)