Board Thread:General Discussion/@comment-13439417-20140923092516/@comment-24386552-20140923210515

And if Regina fought her or killed her, Zelena could die knowing she completely destroyed her sister. I think it is possible. The creators said that Zelena would definitely be back in S4. So either this theory is correct, or Zelena will be revived at the peak end and set the tone for S5. They might be lying too. But the fact they are saying "Definitely" means that Zelena has something to do with the characters in S4. She could appear in a mini-flashback (Assuming the S4 mid season finale will be like the S3 mid season finale) in the midseason finale or an episode where she tried ruining Rumple's plan by telling Regina, but was distracted by Maleficent or another character that got her to turn back and therefore delay Regina and Zelena's meeting.