As a junior player with the Czech national under-18 team, she participated in the IIHF U18 Women's World Championships in 2015 and 2016.

[1][2] In January 2023, Kosinová represented Czechia in the women’s ice hockey tournament at the 2023 Winter World University Games.

She contributed a goal across seven games to help the Czech team secure a bronze medal victory.

Later that year, she participated in the 2023 IIHF Women's World Championship and won another Czech bronze medal.

This biographical article relating to a Czech ice hockey defenceman is a stub.