[2] She made her major debut in the French Open qualifying, after having been handed a wildcard; however, after defeating Dalma Gálfi (the 2015 ITF World Champion in the girls' combined category), she lost to fourth seed, Richèl Hogenkamp, in the second round.

[1] She made her Grand Slam singles main draw debut at the Australian Open, after receiving a wildcard,[4] but she lost in the first round to third seed Garbiñe Muguruza.

[6] Ponchet made her French Open debut, after receiving a wildcard for the singles main draw, where she lost in the first round to the unseeded Lucie Šafářová, in straight sets.

[citation needed] At the 2019 Australian Open, Ponchet reached the singles main draw where she lost in the first round to 19th-seeded Caroline Garcia,[7] after winning all her three qualifying matches without dropping a set.

[citation needed] She entered the Guangzhou Open main draw as a lucky loser but lost to qualifier Moyuka Uchijima.

[9] Partnering Maia Lumsden, Ponchet won her first WTA 125 doubles title at the Open de Rouen, defeating top seeds Anna Bondár and Kimberley Zimmermann in straight sets in the final.

[15] After entering the singles main draw of the Japan Women's Open as a lucky loser, she failed to convert a match point in the third set in her first round loss to eighth seed Elisabetta Cocciaretto.