Technically, she never was. The Scions of the Seventh Dawn were born from merging the Circle of Knowing and the Path of the Twelve. Her sister, Yda, was part of the Circle of Knowing and automatically became a Scion. Lyse never was a member of any group. When she assumed her sister's identity, she continued to be part of the group even though everyone knew her true identity. However, at the end of Storbmlood, she officially resigns from her pseudo-occupation as a Scion.