The details you've provided are not enough for any of us to know exactly what happened in the interaction.
Whatever you do, DO NOT tell her you like her. Let her express her feelings toward you first.
What I can tell you, though, is that you can text-game or online game her. Send her some non-needy, fun and/or outrageous messages. Check the forum for some pre-made message-models.
Next, learn how to read body language. It's relatively easy. Focus on finding ioi's. Again, read the forum, there is an extensive list of IOI's around here.
Then, read and apply the M3 model. Read the thread Start up steps for a beginner , post number 3.
Finally, Have FUN.