2017 Chiles made her senior debut at the American Classic where she only competed on the uneven bars and the balance beam and finished fourth and fifth, respectively. At the
U.S. Classic, she finished fifth in the all-around. In August, Chiles competed at the
U.S. National Championships where she placed second in the all-around behind
Ragan Smith, in addition to a fourth-place finish on the balance beam. During her balance beam performance she flubbed a
wolf turn but saved it by connecting it to an unplanned triple turn. In September, Chiles was selected as the non-traveling alternate for the
World Championships.
2018 On March 18, Chiles made her senior international debut at the
Stuttgart World Cup where she placed third behind
Jin Zhang of China and
Elisabeth Seitz of Germany, posting the highest scores of the competition on vault and floor. On April 8, Chiles was named to the team to compete at the
Pacific Rim Championships. There she won team gold as well as gold on vault and floor exercise and bronze on the balance beam. In August, Chiles competed at the
National Championships where she placed eleventh in the all-around and second on vault behind
Simone Biles. She also placed tenth on uneven bars, fourteenth on balance beam, and twenty-first on floor exercise. She was not named to the senior national team. She received media recognition for competing in a
Wonder Woman inspired leotard. In October, Chiles participated in the Worlds Team Selection Camp. During the competition, she placed third on vault behind Biles and
Shilese Jones, seventh in the all-around and on balance beam, and sixth on uneven bars and floor exercise. While she did not make the world team, she was added to the 2018–2019 national team. In November, Chiles signed her
National Letter of Intent with
UCLA, deferring until after the
2020 Olympics and initially planning to start in the 2020–2021 school year.
2019–2020 In June, it was revealed that Chiles had switched gyms, leaving Naydenov Gymnastics in her hometown of
Vancouver, Washington and moving to
Spring, Texas to train at
World Champions Centre, the same gym at which
Simone Biles trains. Chiles was expected to compete at the American Classic. However, days before the competition, she withdrew. At the
2019 U.S. Classic in July, Chiles finished eleventh in the all-around with a score of 54.650. She also tied for eighth on the uneven bars with
Leanne Wong, placed twelfth on the balance beam, and tied for sixteenth on the floor exercise with
Sloane Blakely. At the
2019 U.S. National Championships in August, Chiles performed all eight of her routines without a fall to place sixth in the all-around. She also finished seventh on uneven bars, tied with
Riley McCusker, placed twelfth on balance beam, and seventh on floor exercise. As a result, she was named to the national team. In September, Chiles competed at the
2019 World team selection camp and placed eleventh with a score of 53.400 after falling on her
Amanar vault and on floor exercise, and she was not named to the World Championships team. Chiles did not compete at all during
the 2020 season due to the
COVID-19 pandemic in the United States.
2021 In February, Chiles became the first ever women's all-around
Winter Cup champion. She also finished first on vault and floor exercise, second on balance beam, and fourth on uneven bars. In May, Chiles placed second in the all-around at the
U.S. Classic behind teammate
Simone Biles. She also finished second on uneven bars, fourth on balance beam, and second on floor exercise. In June, Chiles placed third in the all-around at the
U.S. National Gymnastics Championships behind
Simone Biles and
Sunisa Lee. She also finished third on vault. As a result she was named to the national team and selected to compete at the
Olympic Trials. At the Olympic Trials, Chiles finished third, once again behind Biles and Lee, and was named to the Olympic team alongside Biles, Lee, and
Grace McCallum. Chiles was the only US team member to hit every routine she competed during the season leading up to the Olympics; out of 24 total routines, she did not fall once.
2020 Tokyo Olympics At the
Olympic Games Chiles performed the all-around during qualifications. She finished 40th after struggles on multiple events: on uneven bars she brushed her feet on the ground during a transition between the bars, incurring a deduction equivalent to that of a fall; on balance beam she fell on her acrobatic series and put her hands down on her dismount. Her performance helped qualify the USA team to the team final in second place behind the
Russian Olympic Committee. During the
team final Chiles was initially set to compete only on vault and floor exercise. However, Simone Biles withdrew from the competition after the first rotation and Chiles replaced her on uneven bars and balance beam. She hit both of those routines despite not having warmed up on either, but fell on her third pass on floor exercise. The United States won the silver medal, finishing second behind the Russian Olympic Committee.
2022 In August, Chiles competed at the
National Championships. She finished third in the all-around behind
Konnor McClain and
Shilese Jones. In September Chiles competed at the
Paris World Challenge Cup; she only competed on vault, uneven bars, and floor exercise. She qualified to all three event finals. During event finals she won gold on floor exercise, silver on vault behind teammate
Jade Carey, and placed fifth on uneven bars. In October, Chiles was selected to compete at the
2022 World Championships alongside
Skye Blakely,
Jade Carey,
Shilese Jones, and
Leanne Wong. During the qualification round Chiles helped the USA qualify to the team final in first place. Individually she qualified to the vault and floor exercise finals. Although she recorded the twelfth highest all-around score, she did not advance to the final due to teammates Jones and Carey scoring higher. During the team final Chiles contributed scores on all four apparatuses, helping the USA win their sixth consecutive team gold medal. On the first day of apparatus finals Chiles won silver on vault behind compatriot Carey. On the final day of competition she won silver on floor exercise behind
Jessica Gadirova.
2023 In September, Chiles was named to the team to compete at the
2023 Pan American Games alongside
Kayla DiCello,
Kaliya Lincoln,
Zoe Miller, and
Tiana Sumanasekera. While there she helped the USA win team gold ahead of Brazil. Individually Chiles won bronze in the all-around behind DiCello and
Flávia Saraiva and silver on vault behind
Rebeca Andrade.
2024 Chiles began the season competing at the
Core Hydration Classic, where she placed third in the all-around behind
Simone Biles and
Shilese Jones. At the
National Championships Chiles placed fifth in the all-around and second on uneven bars behind Biles. As a result, she qualified to the
upcoming Olympic Trials. At the Olympic trials, Chiles finished third in the all-around, as well on uneven bars and floor exercise, and second on vault. She was selected to represent the
United States at the 2024 Summer Olympics alongside Biles,
Jade Carey,
Sunisa Lee, and
Hezly Rivera.
2024 Paris Olympics During the
qualification round at the Olympics, Chiles competed on all four apparatuses. She ended the day ranked fourth overall; however, she did not advance to the all-around final due to the limit of two athletes max from the same nation competing in the finals; Biles and Lee placed higher. Additionally, she placed fourth on vault but again did not qualify to the final due to Biles and Carey placing higher. Chiles did manage to qualify to the floor exercise final in third. During the
team final, Chiles contributed scores on all four apparatuses towards the team's first place finish, earning the U.S. their fourth overall Olympic team gold medal. Chiles went on to compete in the
floor exercise final. Although Chiles' initial score was not high enough to earn a medal, Chiles's coach,
Cécile Canqueteau-Landi, submitted an inquiry on Chiles' D-score. The inquiry was accepted and Chiles' score was raised by a tenth. Her revised score was the third highest of the event final, earning the bronze medal. The
Romanian Gymnastics Federation appealed this decision to the
Court of Arbitration for Sport (CAS), on the basis that the inquiry was submitted past the one minute deadline and therefore should not have been accepted. The CAS ruled that Chiles' coach had made the inquiry at one minute and four seconds, which was four seconds over the allowed time. In response to the ruling, the
International Gymnastics Federation (FIG) reinstated Chiles' initial score, which put her in fifth place, and reinstated Romanian gymnast
Ana Bărbosu to third place while moving
Sabrina Voinea to fourth. On August 11, the
International Olympic Committee upheld the findings of the CAS and announced that the bronze medal in the floor exercise would be reallocated to Bărbosu, thus leaving Chiles without an individual Olympic medal. USA Gymnastics appealed the ruling later that day, saying they had video evidence that Chiles' coach had appealed her score at 47 seconds, within the one-minute deadline, and not four seconds late. On August 12, the CAS denied a request to reconsider its ruling. Chiles appealed the decision to the
Federal Supreme Court of Switzerland. On January 29, 2026, the court partially overturned the CAS ruling. The court found that new audio-visual evidence could show that the U.S. coach's scoring inquiry was submitted within the required one-minute time limit, and returned the case to CAS for reconsideration. == Collegiate gymnastics career ==