[10][11][13] For the 100 metre backstroke, she won the silver medal with a Belgian record time of 1:00.90, finishing just 0.02 seconds behind the gold medalist Dóra Molnár of Hungary.

[14] The first day of competition, she ranked nineteenth in the 100 metre freestyle with a time of 55.95 seconds and achieved first-alternate status for the semifinals.

[15] For the semifinals, her alternate status was called upon, after Nikolett Pádár of Hungary withdrew from the event, and she placed thirteenth with a time of 55.68 seconds.

[22] The fourth day, Vanotterdijk swam a 59.06 in the prelims heats of the 100 metre butterfly, qualifying for the semifinals ranking eleventh.

[31][32][33] Approximately 20 minutes later, she was one of three swimmers born after 2004 to compete in the semifinals of the 100 metre backstroke, where she placed fourteenth with a time of 1:01.61.

[35] At the 2022 Swimming World Cup stop in Berlin, Germany, with competition beginning 21 October, Vanotterdijk ranked third in the morning preliminaries of the 100 metre individual medley with a Belgian record and personal best time of 59.54 seconds and qualified for the evening final.

[38] In the evening final of the 100 metre individual medley, she lowered her Belgian record to a 59.34 and placed seventh, finishing 0.77 seconds behind bronze medalist Anastasia Gorbenko of Israel.

[43][44] Competing in the evening final as the only junior swimmer, born after 2004, she swam a personal best time of 57.90 seconds and placed sixth.

[48] At the 2023 Flemish Open Swimming Championships, conducted in long course metres and held in February in Antwerp, Belgium, Vanotterdijk set six new Belgian records in individual events over a period of two days.

[63][64] One week later, she broke the national records in the 100 metre freestyle and medley at the International Swimming Festival in Aachen, Germany.