This girl and I went on a 2nd date a while ago and one way or another things ended up at my place. I tried to push for sex, but there was strong LMR and nothing happened. She was down for heavy making out and letting me touch her all over, but she didn't want to go all the way, no clothes came off. I had started dating her with very strong escalation from the get-go, making out with her an hour into our first date, and telling her and we're going back to my place on the second one as we're heavily making out. She turned me down, but for various circumstances we ended up there anyway.

I stopped talking to her after that time because I'm not THAT into her and I wasn't interested in burning through another date with no sex at the end of it, I have better things to do. She however messages me again and wants to go out. Part of me is earnestly concerned that she just wants to be entertained for a couple of hours and not have to put out, which to me feels a bit manipulative, as I don't like to have that carrot dangled in front of me. At the same time I suspect I might be able to push through it this time, but I have no evidence to show for it. She's still pretty young and might be very shy and inexperienced, but I'm more willing to blame myself for not building enough attraction.

What can I do here? I'm ok with giving it another shot, but I also don't want to be taken advantage of. How do I break myself out of the "sex might happen" zone?

Edit: if you're going to be downvoting, I'm going to kindly ask you to explain your reasoning.