Sieklucka was born in Lublin, the largest city in eastern Poland. She studied at the Wrocław-based Faculty of Puppetry of AST National Academy of Theatre Arts and graduated on 2018. She is able to speak fluent Polish, English, French and German.
She made her film debut playing Laura Biel, opposite Michele Morrone, in the erotic drama film 365 Days (2020) and the sequel. It was the most-watched Netflix film in 2020.