Just try and take some breaks and just sit and relax with the babies, might help to reassure them that they are still a priority. I know I would be confused and depressed too if I was in a new place and all my stuff (and stuff I'm used to seeing around) was in boxes. And give her time... it's alot for a little dog to move... she could be feeling off just from the trip.
We have a small yard that mine run around in, but they would never give up their walks (always and entirely on leash). Especially if we take a different route every now and then. Definitely walk when it's light enough out for you to see... you never know what you may run into in a strange place. I've been here for 20 years and still see scary stuff too often if you ask me!
Congratulations on the move.....hope you all get settled in quickly!
Another thing would be if you are at the same sea-level as you were before... a difference could take time to get used to...