Keeping Girls in School Act This bill authorizes the Department of State and the U.S. Agency for International Development (USAID) to enter into acquisition, assistance, or financing agreements to address societal, cultural, health, and other barriers that adolescent girls face in accessing quality secondary education. USAID's Senior Coordinators for International Basic Education Assistance and Gender Equality and Women's Empowerment and the State Department's Ambassador-at-Large for Global Women's Issues shall oversee all U.S. resources and activities relating to educational opportunities for adolescent girls. The bill requires USAID to seek to ensure program adherence to monitoring, evaluation, and data requirements and gender equality guidance. The Ambassador-at-Large for Global Women's Issues shall review, update, submit to Congress, and make publicly available a U.S. global strategy to empower adolescent girls. The U.S. Global Strategy to Empower Adolescent Girls, issued in March 2016, shall be deemed to fulfill such requirement.