Domestic shorthair. You can get a shorthaired black cat MANY different ways -- no guarantee that it's a Bombay. Bombays are fairly rare still, and reputable breeders don't let their Bombays go around mating with stray cats. A Bombay might not look like a specific breed, but it is just as specific as any other, with a specific body type, head shape, eye shape, eye color, and coat. Your cat's face shape, eye shape, and body type are very different from a Bombay -- which have a very rounded look about them, and have compact bodies like a Burmese. Your gorgeous baby looks just like a beautiful domestic shorthair.
yea i was noticing the roundness of the bombay head. isabel has a much more angled, almost acorn shaped head. shes sucha cutie pie. sad to think that someone abandoned her. i've only had her for ab a month. i live in an apt and a former tenant moved out and left her cat behind. just very wrong, but shes with me now and i will never abandon her, shes my baby!