I don't know that a woman necessarily qualifies as an attention wh0re just because she acts somewhat interested, and then backs off. There are other variables at play. For example, with some girls you have to create more rapport. Apparently you only talked to her once, and then got her number. Obviously, that works well on some girls. But for others, even if they find you attractive they might still want more rapport before dating you. (I'm not even a chick, yet I personally don't really like to go out with a stranger just because she's attractive.)
Another poster touched on the issue earlier, suggesting that "maybe she doesn't drink." That could be it. Or she might only date people of a certain religion. There could be any number of things.
All this girl did was indicate that she found you good-looking, and then when you actively asked for her number, she didn't reject you to your face. A true attention wh0re would be someone who actively flirted with you, or maybe who asked you out, and then flaked.