Re: What breed is she?
Well....without a pedigree, it is difficult to pin down what breed most cats are. In fact, I think pedigree is about the only way, in most cases. The genetics for every breed of cat are out there. Our breeds *began* with someone who liked the looks of a particular cat and began a selective breeding program to get the desired results, consistently. In the early days, regional and geographical isolation kept some of the early 'breeds' pure, until travel became more extensive.
Russian Blue, British Shorthair and Korat are all "blue" (gray) cat breeds. Selectively bred over the years to be homozygous for black, recessive dense (dilutes black to blue), no agouti (no obviously visible tabby stripes) and no spotting (no white markings).
This kitty is obviously black-based, recessive dense (blue-gray), no agouti and no white spotting.