User blog comment:IamJakuhoRaikoben/Chapter 457: Naked Battle, Review./@comment-24277053-20151019185547

Here is one theory I have, Alverez have their own celestial spirits and the strongest are called Platinum keys. And my theory is one is a Platinum Celestial Spirit and like Loke and Capricorn was able to free herself, and she belonged to Layla, which would explain why she looks so young. And perhaps by the end of the arc, she will be another one of Lucy's spirits.