Minnen made her WTA Tour main-draw debut at the 2018 Luxembourg Open in doubles, partnering Alison Van Uytvanck.

In May 2021, again partnering Van Uytvanck, they lost in a second WTA Tour doubles final to Aleksandra Krunić and Nina Stojanović in Belgrade.

In September 2021, she reached the third round at the 2021 US Open as a lucky loser defeating Nadia Podoroska and Liudmila Samsonova.

[1] Partnering with Bibiane Schoofs, Minnen won the doubles title at the WTA 125 2023 L'Open 35 de Saint-Malo, defeating Eri Hozumi and Makoto Ninomiya in the final.

[citation needed] Minnen reached the third round for the second time at the US Open, as a qualifier,[3] defeating wildcard Venus Williams en-route, 6–1, 6–1 in 73 minutes,[1][4] and Sachia Vickery,[5] climbing 29 spots to world No.