Board Thread:Spoilers!/@comment-24304025-20150202171011/@comment-5899967-20150304005357

ChocolatEyes613 wrote: Chameleon-Guy wrote: I agree with Hmcooper, Zelena would have reverted back to her real form after leaving Storybrooke. I'm not even sure about how Zelena could revive into the portal in 3x21. Rumplestiltskin wrote, that Zelena was the most powerful sorceress he ever encountered.

As I said, there are various theories. The book is said to be able to reverse deaths and change the stories.