Hermia is the psychic at Merri-Lee Marvil's New Year's Yves Party. She predicted the forming of the Pretty Committee and gave Massie Block a purple stone. She predicted that 5 pieces would come together at midnight (Massie's charm bracelet and the Pretty Committee girls). Afterwards, Massie transferred to OCD and abandoned the Ahnabees. Hermia is mainly featured in Charmed and Dangerous: The Rise of the Pretty Committee, and A Tale of Two Pretties.
In A Tale of Two Pretties, it is mentioned that Alicia gets texts from Hermia predicting Alicia's future. The girls go to see her again in the same book, to discuss how their futures will be when Massie goes away to London.