She won one of the bronze medals in the women's kumite 68 kg event at the 2019 European Games held in Minsk, Belarus.

[1] In the same year, Melnyk also won the gold medal in the women's team kumite event at the 2019 European Karate Championships held in Guadalajara, Spain.

[3] In November 2021, she won one of the bronze medals in the women's 68 kg event at the World Karate Championships held in Dubai, United Arab Emirates.

[4] Melnyk competed in the women's kumite 68 kg event at the 2022 European Karate Championships held in Gaziantep, Turkey.

[5] She also competed in the women's kumite 68 kg event at the 2022 World Games held in Birmingham, United States.