Board Thread:Spoilers!/@comment-27060727-20171018191424/@comment-31937823-20171221221145

Gothel didn’t seem to have any grudge with anyone specifically in any scenes in 710. They need a way to incorporate Tiana in the story, but I doubt Gothel would have any reason to want revenge on her. Regina didn’t acknowledge if she had known Gothel in the events in The Eighth Witch. So I’d say Zelena is the most likely.