So, if she’s…but how? When? Why? Whaat? Oh well…Maybe it has to do with Emma screwing up time. I won’t flip tables until I see how this plays out. Thank you for the cookie, RG. I’ll keep it close for comfort on the rocky road ahead.
The most common theory is that when she “died”, her essence lived on in her pendant. We saw Zelena’s magic open the time vortex, so it’s likely Zelena’s essence traveled back in time, and she somehow reformed her body.