She's a beautiful Domestic Shorthair (DSH) tabby. The swirl markings are called marble markings. DSH is not a breed but a description. It's basically a "regular" cat like the vast majority of American cats. Either way she's adorable. I love tabbies - I have two!
Thank you. She is the most laid back kitten I've ever been around. She can go from getting into everything to, not just laying down, but flopping her bones down right in front of me and s-t-r-e-t-c-h-i-n-g out as far as she can. I, also, have a chihuahua that she loves to pick on and, when she is wanting to play, flops down in front of, too, and the chase is on.