Węgiel's professional singing career began in 2018, when she auditioned for season one of the Polish version of "The Voice Kids". At her blind audition, she sang "Halo" by Beyoncé, and had all three coaches turn their chairs for her, eventually joining the team of Polish singer-songwriter Edyta Górniak, who represented Poland at the Eurovision Song Contest 1994. When Górniak first heard Węgiel's voice, she described her as "unreal" and stated that she did not believe even Beyoncé had such a strong voice at that age. Węgiel was declared the winner in the final on 24 February 2018, during which she performed Górniak's 1994 Eurovision entry "To nie ja!", and an original song "Żyj". After winning the competition, she was signed to Universal Music Polska, and released her second single "Obiecuję". In October 2018, Węgiel collaborated with Górniak on the single "Zatrzymać chwilę", recorded for the soundtrack of the Polish version of the film "".