Portunova was the alternate for Team Victoria Moiseeva who represented Russia at the 2016 European Curling Championships. The team qualified for the event by defeating the two-time world bronze medallist Anna Sidorova rink in the Russian Supercup. Despite entering the event as rookies, the team qualified for the playoffs with a 6–3 record. They then upset Scotland's Eve Muirhead 11–6 in the semifinal to qualify for the final where they faced Sweden's Anna Hasselborg. Tied 4–4 in the final end, Hasselborg missed her final draw, giving the Russian's two points and the victory. Also during the 2016–17 season, Team Moiseeva won the silver medal at the 2017 Winter Universiade, losing to Canada's Kelsey Rocque in the final.