More than a month after a court-ordered deadline to reunite families separated at the U.S.-Mexico border under President Trump's zero tolerance border enforcement policy, some 500 children remain apart from their parents.

The majority of these remaining children, nearly 350 of them, are in the U.S. alone after their parents were deported without them.

One of them was Sandy, a 16-year-old girl whose father was deported back to Guatemala after they were detained at the border in May. She had lived in a federal shelter since their separation.

Her parents in Guatemala said they desperately wanted her back. But the process to get her returned was a slow one. She appeared before a Los Angeles immigration judge recently, eager to return home and asked to leave voluntarily.

Even with the judge's approval, she was told she couldn't return until early September. Then she learned her flight home had been moved up and she returned to her family this week.

This story has been updated.