Playing for the Nigeria women's U-20 team, Sunday made her first appearance in a FIFA tournament at the 2010 U-20 World Cup in Germany, entering the Group C match-up against Mexico as a substitute. She also took part at the 2014 FIFA U-20 Women's World Cup in Canada, where she scored 3 goals in 6 matches. She scored three goals at the second round of the 2014 African U-20 Cup of Nations for Women.