Carol was assigned to the case of Ethan Dawson, whose parents were unable to care for him because they were hospitalized after a car accident. He tried to escape from her care because he wanted to stay with his parents rather than go to the foster home. Owen offered to get him a bed for the night so he could stay in the hospital with his parents. Carol was reluctant as it was not a permanent solution, but she agreed to it for one night.
When she took a bathroom break, Ethan left the room to search for his parents. ("Can't Fight This Feeling")
Carol was called back to the hospital after Ethan's grandfather was delayed in getting to the hospital, but he was once again admitted to peds for the night. ("She's Killing Me")