Board Thread:Spoilers!/@comment-5094906-20141119193942/@comment-24674051-20141215184508

I think the undead reference is due to the fact that he form in season 2 (the last time we saw referenced to Maleficent) was as a Spectre (or some simlar undead-type form). We know nothing of Maleficent since the 2nd Curse was cast.

My hunch (which is similar to what others have posted) is that she returned to Normal when she was returned to the EF (when Regina dispelled the original Curse). She was subsequently brought back when Snow cast the second curse, though I doubt that she is under the library (at least not at the moment, though it might make a good lair of TQOD when they move back).

In fact, it is possible that TQOD all fled storybrooke right after Zelena was identified as the WIcket Witch. None of them probably wanted anything to do with Zelena, and sought the first opportunity to slip out of town, not realizing that it was, in fact, a one-way trip. There may be other denizens of the EF that managed to get past the Monkey's and cross the town line.