Board Thread:Spoilers!/@comment-27060727-20170915041416/@comment-31937823-20170920020417

LadyTremaine wrote: I don't no, but i think it's unlikely that she won't appear. Maybe Tremaine crushed her heart to cast the curse (but she probably wasn't the caster, so, i have no idea).

Actually, the writers confirmed that Lady Tremaine was not the one to cast the curse.