Silence after a kiss?

So I have been friends with a girl for a very long time. We have been hanging out quite a bit lately, and on Monday before she went home we hugged, I gave her a kiss on the cheek, and then she kissed me. I thought I was very deep in the friend zone, but this has confused me. I did feel some tension between us for a while though.

Since then she sent me a few messages on Tuesday, but nothing really important and then stopped responding completely. She has been silent ever since.

What do I make of this, or how do I handle this further?
Silence after a kiss?
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