Samodurova started her season off at the 2018 CS Lombardia Trophy. Placing second in the short program and fourth in the free skate, she placed second overall, earning the silver medal, trailing behind fellow Russian competitor Elizaveta Tuktamysheva. She made her Grand Prix debut at Skate America, where she won the bronze medal behind Satoko Miyahara and Kaori Sakamoto with a personal best score of 198.70 points. In mid-November she competed at the 2018 Rostelecom Cup where she won the silver medal behind Alina Zagitova after placing second in both programs. With one Grand Prix silver medal and one bronze medal she qualified for the 2018–19 Grand Prix Final, where she finished fifth with a personal best score of 204.33 points: "Achieving the season’s best was great. I believe that today I did everything to the maximum." At the 2019 Russian Championships, Samodurova placed sixth in both programs and overall. She was the third-ranked skater eligible to compete at senior international competitions, behind Stanislava Konstantinova and Alina Zagitova. At the 2019 European Championships in Minsk, Samodurova placed second in the short program behind Zagitova, passed the 70-point mark for the first time. In the free program, Zagitova skated poorly, while Samodurova skated a clean program and won the European title ahead of Zagitova and Finnish figure skater Viveca Lindfors. Of the result, she said "I can't find words to describe what I am feeling now. I am European Champion and that's so awesome!" Samodurova was assigned to the World Championships in Saitama along with Zagitova and Evgenia Medvedeva. She placed ninth in the short program, and expressed disappointment that her scores were lower than those at the European Championships. She rose to eight place in the free skate, making only one minor error on a double jump, and said she felt "only happiness" with the result. Samodurova concluded the season as part of the bronze medal-winning Team Russia at the 2019 World Team Trophy.
2019–2020 season
Samodurova admitted to having some issues in training for the new season after falling multiple times at the Russian test skate events. On the Challenger series, she placed sixth at the 2019 CS Lombardia Trophy before winning the 2019 CS Ice Star. On the Grand Prix, she was fifth at the 2019 Cup of China, after struggling with underrotations on several jumping passes. Fourth at the 2019 CS Golden Spin of Zagreb, she finished the season with a ninth-place finish at the 2020 Russian Championships.
Small medals for short and free programs awarded only at ISU Championships. At team events, medals awarded for team results only. Personal bests highlighted in bold.
