In the Battle of the Labyrinth after Annabeth kisses Percy in the volcano, (very strange sentence...) where does she go? She runs out and ... what? I'm confused. I know I should know this, but where did she go? Here's the scene:

The Battle of the Labyrinth

Annabeth glared at me like she was going to punch me. And then she did something that surprised me even more. She kissed me.

"Be careful, Seaweed Brain." She put on her hat and vanished.

Is that it? She just ... vanishes??