She’s beautiful! I’d describe her coloring as black shaded. This is a very unique coloring that we don’t see too much in randombred cats. Most likely, she got it from some Persian ancestry. She is a nice lookalike to a Burmilla, but that’s a fairly rare breed. Burmillas got their shaded and chinchilla coloring from Persians as well, as they were originally a chinchilla Persian x Burmese cross.
Your cat's coat is so beautiful! She (I guess she's a female?) reminds me of a british shorthair because of her overall face shape (especially the nose + eyes).