Delacauw made her debut for the Belgium national team on 21 February 2021, coming on as a substitute for Lenie Onzia against Germany.[4][5]
She was named in the Belgium squad for UEFA Women's Euro 2022 in England, where the Red Flames were beaten in the quarter-finals 1-0 by Sweden. She went on to contribute to Belgium's successful qualification for UEFA Women's Euro 2025 via the play-offs, starting both legs of the play-off final against Ukraine.[6][7]