Olsen made her debut for the senior Denmark women's national football team in February 2003; a 4–0 defeat to Norway in La Manga Club. In October 2011 Olsen was recalled to the national team after a five-year absence, for a UEFA Women's Euro 2013 qualifying tie with Austria. She was named in national coach Kenneth Heiner-Møller's squad for the final tournament, where Denmark reached the semi-finals. Olsen retired from football in June 2014.