The text which tells that Valli was enjoying her ride on the bus is as follows-

(i) "Valli devoured everything with her eyes."

(ii) "On one side there was the canal and, beyond it, palm trees, grassland, distant mountains, and the blue sky. On the other side was a deep ditch and then acres and acres of green fields—green, green, green, as far as the eye could see.
Oh, it was all so wonderful!"

(iii) "Everyone laughed, and gradually Valli too joined in the laughter. "

(iv) "Somehow this was very funny to Valli. She laughed and laughed until there were tears in her eyes."

(v) "Valli wasn’t bored in the slightest and greeted everything with the same excitement she’d felt the first time."