Michael K. Eidson
Archmage
Um...It seems to me that the more pieces she collects, the more her emotions gradually unlock. As for some of your other questions...I can't seem to answer right now; my head hurts from thinking about this too much. It could be an instinctual level to help Kisa be happy. *shrug*
I'm only trying to help by asking the hard questions. Depending on how you tell the story, readers might not require answers to all of them, or any of them. I find it helps to have answers to the hard questions answered for myself, but they don't always have to be revealed in a story. It just helps keep the story self-consistent when the author knows the answers.