Hold it steady Tiger
By the sounds of it, things are about ready for you to move on. Coming out like that all of a sudden did probably freak her out a bit. Other than that though, you carried on the conversation just right.
However, if you did want to, you could always try playful response. A last resort neg would also be extremely effective. Another idea would be to just simply state that you thought she was interesting, but you would rather be friends. A woman is always prepared to give the "Let's be friends" speech, but she is never ready to receive the speech from anybody. Doing this captures her attention and challenges her for not responding to you. After that, make her regret not hanging out with you in the first place.
I once was in the same situation with this one lady. She had been ignoring me for the whole week, but I made public every awesome thing I did on Facebook that week. It caught her attention, and she apologized for ignoring me. If I had not rushed back into it, I could have gotten her easily. However, that was at a time when I still did not understand the rules of the game. I do know now, and I certainly know I will be using it when the situation arises again.
"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