Say you've only been talking for a few weeks, and have hung out with each other several times. Then you have a particularly "intimate" evening, and before she leaves, she asks when she will see you again? Would this scare you away?
No, that wouldn't be a scare. It would actually be quite sweet, because it would mean she had a good time and cared about seeing me. What would put me on the spot, though, is deciding right then when our next meet up would be. So it would be better for her to say something like "I'd love to see you again" or "I can't wait to see you again."