Board Thread:Spoilers!/@comment-1916997-20171216041419/@comment-25375217-20180312200902

Although we know we'll see Wonderland in 714, we also know we'll see Alice's "other places" at some point (I'm fairly certain they said that, anyway). So I don't think Dr. Sage appearing in 714 explicitly confirms she's from Wonderland. Alice could stop by Wonderland, and then head off to the Kuzconian Empire where she meets Yzma.

Because the Duchess is such a little-known character and they aren't likely to do another version of the Queen of Hearts after Cora, I'm inclined to be doubtful unless she's the Red Queen or the Jabberwock (since they have no issue redoing characters from the spin-off.)