Is she the reason Philip got his soul back? What if that is what the necklace holds, the souls of those that have been trapped by the Wraith or those souls that are lost.
That’s an interesting theory, especially since we never saw how Phillip was ‘reunited’ with his body, so to speak. I get the feeling, Aurora and Phillip owe Zelena some kind of debt. In return, they are bound to serve her and if they should ever disobey, she’ll harm their baby.