It’s actually listed in Elaine’s page of the Dresden Wiki.
Jim definitely had “The Lady of Shalott” in mind when creating the character, she died alone and untouched in her tower of unrequited love when Lancelot passed her over (Elaine Lilian (The Lily is a sign of purity in the poem and wider)Mallory) here this Elaine survived both Harry and his love. Not to be confused with the other Elaine in Mallory’s Morte d’ Arthur, who was Galahad’s mum (or is it, does Harry have an adult son by Elaine (who wasn’t pure and untouched) who will take the Grail from Nicky?)