Upon finding a painting of her, the sole drive behind Mythe's initial quest is to seek out the girl in the picture. He finds her in the Mausoleum in Vafton. Later they revisit the place and encounter Iskandar there. She is the only person other than Iskandar who can access the inner depths of Undercity Pharos.
In Ventus's scenario, she is recruited from an inn in Iskandaria, and is required in order for Ventus to acess the Undercity Pharos.
A good magic stat and a Lvl 4 Arcane Tongue starting panel gear Silver Girl towards being a good mage, despite her poor elemental growth. Her Strength is so-so, so she can also utilize physical attacks if necessary.