Nieminen has represented Finland in international ice hockey competition since 2015, first appearing with the Finnish national under-18 team at the 2015 IIHF World Women's U18 Championship in Buffalo, New York, where she notched five points (2+3) in five games. She scored seven goals and tallied seven assists for the Finland Selects at the 2015 World Selects Invitational in Bolzano.