I wonder if going back in time as dust changed Zelena in some way? Can she, her physical body be used to time travel or be part of a spell for time travel that was previously unthought of?
Yeah, I really hope they don’t do this but….you never know with this show. Too many inappropriate story lines for a ”family show”, new magical rule/items discoveries.
They could always use her hair or her tears.
Maybe it’s not time travel. Maybe it is lifting characters off the page of the book and into ”reality”