Demir took the bronze medal in the 65 kg event at the 2018 European Juniors Wrestling Championships held in Rome, Italy defeating Hungarian Noémi Szabados by 5–3.[1]
She debuted in the seniors category at the 2018 World Wrestling Championships in Budapest, Hungary.[2] She was eliminated in the Round of 32 in the 65 kg event to Chinese Tang Chuying by 1–6.[3]
She received the bronze medal in the 65 kg event of the U23 category at the 2020 Individual Wrestling World Cup in Belgrade, Serbia.[4]
She lost the quarter-finals match to Bulgarian Mimi Hristova by 2–7 in the 65 kg event of the 2021 World Wrestling Championships in Oslo, Norway, and placed eight.[5] At the 2021 U23 World Wrestling Championships in Belgrade, Serbia, she became bronze medalist in the 65 kg event defeating Italian Elena Esposito by 3–2 in the repechage match.[6]
At the 2022 European U23 Wrestling Championships in Plovdiv, Bulgaria, she won the silver medal in the 68 kg event after losing to Irina Rîngaci from Moldova in the final.[6][7]
At the 2022 European Wrestling Championships in Budapest, Hungary, she lost the quarter-finals match in the 68 kg event to Natalia Strzałka from Poland by 6–13.[8] She took the bronze medal defeating Oguljan Egemberdiyeva from Turkmenistan by 10–0 in the 68 kg event at the 2021 Islamic Solidarity Games in Konya, Turkey.[6][9]