Later Varvynets had good results in Junior Worlds and Europeans, where she had 4 Top-10 finishes in 6 races and won a silver medal in relay.

She debuted for the Ukrainian team at the World Cup on 16 January 2014, in the women's sprint in Antholz-Anterselva, Italy, where she was 61st.

In 2014-15 season, she had some good results in IBU Cup, so she got a spot in the women's national team.

She made two additional shots and had good chances to win a medal, but due to her low speed, Ukraine finished just 6th.

Later that year, Iryna participated at 2016 World Championships in Oslo, Norway, where her best finish was 9th in individual race.