I Am Struggling With My Relationship

So I finally kissed her (on the cheek. I know, I'm a wimp) while we were hugging. We held hands that night and she put her head on my shoulder, even put her leg on mine a few days ago. But after I kissed her, she stayed in the hug for a bit longer, then left quickly. Now she says she wants to talk sometime today. What do I do? What did I do wrong? Advice?