Educated guess? She appears as herself and gives the audience a look at her witch-y ways.
Ms. Nicks is already the source of admiration and adoration for Lily Rabe's necromancer "Misty Day"
Being a HUGE Nicks fan and a fan of "Coven" I can't wait for Stevie to finally out herself as the mythic witch she truly is!
Keep up with what's happening at the "Coven": http://www.fxnetworks.com/ahs/
Get More Stevie at: http://rockalittle.com/