In 2016 Season, Sergeeva won the all-around bronze at the 2016 Russian Junior Championships. She competed at the Brno Junior Grand Prix winning team silver and at the Junior World Cup in Guadalajara, she won silver in team and event finals: gold in rope, clubs and silver in hoop. She was selected to compete at the 2016 European Junior Championships where she won team gold (with Alina Ermolova and Polina Shmatko), she qualified in hoop finals and won the gold medal. On September 9–11, Sergeeva together with seniors Margarita Mamun and Aleksandra Soldatova represented team Gazprom at the annual 2016 Aeon Cup in Tokyo, where they won the team gold and with Sergeeva winning the junior all-around title.