She's a domestic longhair, her color is dilute tortoiseshell. Although I think I see stripes on her gray spots. . .it's harder to tell on longhairs. If so, she's a dilute torbie (tortie/tabby).
Agree. Just to add, she obviously is also carrying whtie. So and And white to her description. Or you can even say, diluted torbie tuxedo. Most cat people will understand precisely what you mean. Even if the word tuxedo formally refers to the black and white pattering.
And my advice?: Hurry, do marry her before somebody else does it. They dont get prettier than this, you know!
If you by any reason cant marry her, so adopt her, so she will be at least a member of your household and family.