She finally notices

Sayza looks at her, and then follows her pointing finger, finally looking down at herself and becoming aware she's been standing there almost entirely naked.

You watch as she freezes in place for a moment. Her pupils shrink, her eyes conveying the shock and embarrassment, but her body seemingly paralyzed, as if to move a muscle would confirm that this is really happening and she's standing there naked in front of a girl she was trying to flirt with.