Second date is over, still didn't get beyond a makeout. Which was hard enough, so I'm probably going to next her soon.

But I'd still like to pose the question: she texted me soon afterwards saying that "we can see each other again but we're no good match for an LTR because <some rationalization here>"

What's the most probable thing going on in her mind?

And what's the best reply? I consider something like "You're right", "I don't want one anyway" and "Let's see."