No, she does not know. The idea of enjoyment was foreign to her, though she was beginning to understand. Yusuke's explanation helps. Yin is able to form, in her mind, some sort of idea of things that please her. Perhaps bring in enjoyment, even if she doesn't feel it strongly.

"I...I think I enjoy the company of my friends. And I like the chocobos," Yin finally manages to respond. "And cats." She's still learning about a lot of things.