Board Thread:Spoilers!/@comment-2153169-20170909025746/@comment-1916997-20171030204315

I think I figured it out:

Eloise is the mystery woman that will first show up in the Winter Finale. She will be Alice's love interest, WHook's daughter, and possibly the Guardian Rumple is looking for. She was kidnapped by the Witch, who should be Mother Gothel. Mother Gothel had previously captured Rapunzel, who is actually Lady Tremaine, but with the help of WHook, she escaped. She then had two daughters with Lord Tremaine, and after he died married Cinderella's father.