But she wasn’t. The curse was already coming over the land and the queen was racing towards the castle ahead of the billowing black cloud that was the curse. It seems too close together those rings of power releasing in the last episode.
Though now that i think about it maybe the curse was released first because they were trying to hurry at that point already. So maybe it was curse, Pinocchio, and then Emma so the curse wouldn’t explain the third ring. I don’t know.