Re: "Taking it slow" problem!
As Will Smith says in Hitch, three dates is enough to get you a kiss and on the track towards a great relationship. I don't even doubt in the slightest bit that 1.5 days is enough time to get to know someone. I would agree that this is a defense, but as to the kind of defense can be iffy. It may be out of a protection of her nice girl identity, or it can be because she doesn't feel enough rapport yet. I have no idea what was exactly discussed between you two, but I'm pretty sure it was enough.
Persistence will end up being everything. As Lancelot said, just keep chugging at her. Flirting, sexual escalation, the works.
"There is no better than adversity. Every defeat, every heartbreak, every loss, contains its own seed, its own lesson on how to improve your performance the next time." - Malcolm X