Melania Trump has finished her first week as first lady  a title that automatically makes her one of the most prominent women in the country. And yet she was barely visible. She cut an elegant figure at her husbandÂs swearing-in and at the inaugural balls. But two days later, she returned to New York, as she had said she would, to tend to her 10-year-old son, Barron, who remains in school there.