In April Simakova made her senior international debut at the Tokyo World Cup where she finished fourth behind Mai Murakami of Japan, Trinity Thomas of the United States, and Mélanie de Jesus dos Santos of France.

[2] In July she competed at the Russian Cup where she placed fourth in the all-around behind Melnikova, Anastasia Ilyankova, and Viktoria Komova.

[3] On 20 July, Simakova was named to the Russian team to compete at the 2018 European Championships alongside Angelina Melnikova, Irina Alexeeva, Lilia Akhaimova, and Uliana Perebinosova.

[5] On 29 September, Simakova was named on the nominative team to compete at the 2018 World Championships in Doha, Qatar alongside Lilia Akhaimova, Irina Alexeeva, Angelina Melnikova, and Aliya Mustafina.

[9] During team finals Simakova only competed on balance beam where she helped Russia win the silver medal behind the United States.

[18] Shortly after the conclusion of the Russian Cup Simakova was named to the nominative team for the 2019 World Championships alongside Angelina Melnikova, Daria Spiridonova, Lilia Akhaimova, and Aleksandra Shchekoldina.