I notice you didn't specify the kind of conversation this was. Sounds like someone you met through online dating that you were wasting your time sending bull**** texts back and forth or messaging through the site message system.
Unless you're really, really hot as a guy the chances of getting nudes(which to me is what she thought you were hinting at wanting)from a girl you haven't met or ****ed yet are limited if the girl is attractive in any way. It's both an anti slut defense for which you can do nothing about because you haven't even met her yet(and any way you try to supplicate her for the nudes will make you look like a thirsty, desperate faggot), and, it's also a way she can deny you and stroke her own ego while getting some sweet attention whoring out of the way because she knows she has something(her body)you want.
My question is why you're bothering at all with this crap, when it comes to online dating you send a few messages back and forth to get the number, nothing serious, then you setup the date.