And honestly, when did Snow or Regina find the time to do all that work? I guess laywork could have been done in the EF after everyone returned in New York Serenade, but that’s a lot of work for two people.
I’m pretty sure the census record books were created by the Curse’s magic.
I agree that she may have somehow come during the second curse.
She’s been in our world a lot longer than a year, I can guarantee you that. She might’ve arrived in Storybrooke amid the chaos of the second Curse and the fight against Zelena, but she didn’t come BECAUSE of it (as is proven by the census records).