Anastasiia made her international debut at the 2017 Junior World Championships in Osrblie. As part of the Russian national team, she became the world champion in the youth women's relay. She also finished 13th in the individual race, 12th in the sprint and 8th in the pursuit. She improved her results at the next 2018 Junior World Championships in Otepää, finishing 3rd in the individual race, 4th in the sprint and becoming the champion in the pursuit.