The most successful Belgian women's skater in history, she is the first-ever World, European, and Grand Prix medalist from Belgium in that discipline.

[7] Coached by Carine Herrygers in Turnhout,[8] Hendrickx debuted on the ISU Junior Grand Prix series, finishing seventeenth in Dresden, Germany.

Competing in the 2015–16 ISU Junior Grand Prix series, Hendrickx placed fourteenth in Riga, Latvia, and then eleventh in Logroño, Spain.

The journey to Pyeongchang, South Korea, was the longest Hendrickx had ever travelled before and the first time their mother had attended a major international event to watch them compete in person.

At the end of January 2020, she had a tendon injury in her left ankle, keeping her off the ice until past when the onset of the COVID-19 pandemic closed rinks.

Hendrickx started her 2020-21 season at the inaugural CS Budapest Trophy, achieving a new personal best in the short program and winning the gold medal overall.

[23] Hendrickx's fifth-place ordinal qualified two placements for Belgium at the 2022 World Championships, and the possibility of a second spot at the 2022 Winter Olympic Games in Beijing.

[28] Hendrickx's first Grand Prix assignment was initially the 2021 Cup of China, but following its cancellation, she was reassigned to the 2021 Gran Premio d'Italia in Turin.

[29] On her birthday, Hendrickx unexpectedly placed first in the short program with a new personal best of 73.52, following an error by pre-event favourite and World champion Anna Shcherbakova.

"[31] Hendrickx attended her first European Championships in four years in Tallinn and placed second in the short program with a clean skate, winning a silver medal.

"[32] However, in January 2024, the Court of Arbitration for Sport made the decision to annul Kamila Valieva's first-place result after she was found to have tested positive for using banned substances at the 2022 Russian Championships.

[33] Named to her second Belgian Olympic team, Hendrickx served as Belgium's co-flagbearer during the opening ceremonies, alongside alpine skier Armand Marchant.

[36] The Belgian skating federation initially forgot to submit Hendrickx's name to compete at the 2022 World Championships, but upon publication of the entry list, they were able to correct this via appeal to ISU president Jan Dijkema.

[37] Due to Vladimir Putin's invasion of Ukraine days after the Olympics concluded, all Russian and Belarusian athletes were banned from participating at the World Championships.

"[2] For Hendrickx's short program for the new season, regular choreographer Adam Solya created a Latin-themed medley of "Sí, Mamá" and "Mi Gente."

[43] She won the gold medal by almost fifteen points, though narrowly finishing second in the free skate behind silver medalist Wi Seo-yeong.

[44][45] After being disappointed by the free skate scores at her first two events, Hendrickx and her choreographer, Adam Solya, made changes to program music and choreography.

[47] She debuted another revision to her free skate, discarding Fachinetti's "Poeta" in favour of additional original music by Karl Hugo.

"[49] Her second event, the 2022 Grand Prix of Espoo, was widely seen as a contest between her and 2022 MK John Wilson Trophy champion Mai Mihara of Japan.

[51][52] She struggled more in the free skate, making several jump errors, but with the competition as a whole being "turbulent" and with many skaters underperforming, she remained in third place overall and won the bronze medal.

"[53][54][55] Entering the 2023 European Championships as the favourite for the gold medal, Hendrickx underrotated her triple Lutz and managed only a double toe loop as the second part of her jump combination, placing second in that segment behind Georgian Anastasiia Gubanova.

"[57] Hendrickx fell twice in the free skate, placing third in that segment, but remaining second overall by a margin of 0.97 points over Swiss bronze medalist Kimmy Repond.

"[64] In the off-season, Hendrickx joined Stars on Ice for its Japanese, Canadian, and American tours, performing in North America for the first time.

"[69] She finished first in the short program, despite a quarter rotation call on her triple toe loop and singling her double Axel attempt.

[70] However, she struggled in the free skate, coming third in that segment and dropping to third overall, albeit only 2.48 points back of gold medalist Hana Yoshida.

[71] Upon her return to Belgium, Hendrickx "lost a lot of weight and muscles" as a result of the illness, and also injured her back while training a triple Lutz jump.

[72][73] Jump errors in the second half of her free skate saw her fourth in that segment, but she remained second overall, finishing 0.20 points ahead of Yoshida in third place.

[72] Hendrickx entered the European Championships in Kaunas as the title favourite, and won both segments of the competition to take the gold medal, despite a few minor jump errors.

Hendrickx discussed the stress of the event, concluding she was still "very proud of the short program" and that she aimed for and admired the consistency of eventual champion Kaori Sakamoto.

[86] In late January, Hendrickx announced that she would miss the rest of the season because she needed to undergo surgery in February to repair her ankle, which had damaged ligaments and had never fully recovered from her injuries in 2019.