The first lady announced a new program earlier this year to help adolescent girls improve their lives by attending and staying in school.
She since has travelled to Japan, Cambodia and London to promote the initiative.
Obama says the U.S. will continue to urge developed countries to join the effort. And when they join, she says "I'm going to hop on a plane and join them" to highlight the work.
The first lady says she'll also visit developing countries to show how the program benefits girls and their communities.
She spoke Monday at an awards luncheon sponsored by the women's magazine More.