I like this, specially since you avoided the usual ways people "age up" a character (if that's what you were doing, she looks older to me so I just assumed). Anyway, I'm happy you kept her outfit the same and the fur is a nice touch. The hair is probably my favorite part!
I really like this! Especially because her body shape is slightly more curvy than I usually see others depict her. The fact that she's super skinny in the Zelda art doesn't matter. I like this better, because it makes her more realistic. Not everyone is super skinny like an anime girl. Her face has that expression on it that I find so characteristic for Fi. She is wise, yet enigmatic. :3