It's not very interactive, but it's there. She's open to anyone, and it's possible that a wide range of characters would recognize her. Took a small cue from the prior post and had the cauldron smoke be violet. Can't think of a better signal than that. She's pretty obvious to everyone else, as well, little girl with a fairy tailing her, performing magic in the middle of the street.

EDIT: Almost forgot, the tune to the Goron's hymn is a lyric to the tune of Saria's Song. In case anyone cared.