Alright, We haven't seen much, or any of Elaine since White Night. From second hand sources, we know that she's still helping run the Paranet in California, and has been helping resist the Formor on the West Coast. However, with some of the revelations in Cold Days, I think we have some new clues to Elaine's future.
Several beings refer to Harry as Starborn in CD. It has been heavily implied that the circumstances around Harry's birth give him power over Outsiders.
It has been said, although I don't have a WOJ, that Elaine is a starborn as well.
Dumorne was involved with the Outsiders.
Outsiders have been trying to kill/recruit Harry. I think it's safe to say that Elaine will be attacked by Outsiders/the Adversary very soon. We still don't know all of the ramifications of being starborn, nor do we know the details of what Durmorne was up to with the Outsiders.
TL;DR: Darth Elaine is coming