With the 1.4 update to Disney Emoji Blitz, players are able to sync their progress to their Facebook account. Although players were able to connect with Facebook prior to this update, this did not have the progress sync functionality so it did not save any game play.
Players who synced with Facebook prior to this update will need to log out and log in again to prompt progress saving. If this re-sync was not completed after the update, then game play was not saved and will not be retrievable.
For more information on syncing, see How do I sync my progress in Disney Emoji Blitz?