Who is Linda Heffer from Betrayed: A House of Night Novel and what is their importance?

Linda Heffer is Zoey's mom. She is married to John Heffer, who is Zoey's stepfather. Linda is a PTA mom and volunteer because she no longer has to work now that she is married to John. Zoey says her mom changed after marrying John in that Linda does and believes everything that John says rather than making her own decisions.