I'm just a newbie myself so feel free to ignore my advice. But...
When she asked you if you liked her, I would have thought this was the perfect chance to amp it up from just kissing. Maybe just say something like 'let me show you what I think of you' and go for it. Actually I just re-read your post - did she ask you face-to-face or over the phone? It's not really clear from your post... If over the phone, I don't think it really matters too much what you say. Why didn't you want to answer her? If you didn't like her you wouldn't be talking to her right? She is validating herself to you. It sounds like a good sign to me!
As for asking her if she likes you... This was probably a mistake. In my own admittedly limited experience, this is a major turn off coz it demostrates neediness and emotional insecurity. Like the previous poster said, be a man!
From here, I would suggest when you speak to her you say something like 'I think we were getting really well, so I feel bad about what happened. How about I make it up to you by...' and then suggest something nice and romantic to do, and then, like the previous poster said, sweep her off her feet! If that (or whatever else you try) doesn't work, fuck her off and find someone else!
Hope that helped

Good luck and keep us posted!
PS - I would greatly appreciate anyone with more experience critiquing this advice, given I'm a newbie and all...