What is her backstory ?

White Lily started out as a student at the Blueberry Yogurt academy, studying magic with Pure Vanilla Cookie. While at the academy, White Lily and Pure Vanilla researched beyond what they were taught, attempting to go beyond the bounds of the laws of nature. White Lily, being ever the curious one, explored beyond the bounds of what was allowed, delving into forbidden magic beyond what she, as a student, was supposed to learn.