Cui made her ISU Junior Grand Prix (JGP) debut in August, placing sixth in Brisbane, Australia.

In January, she won the junior bronze medal at the 2018 U.S. Championships, having finished third behind Alysa Liu and Pooja Kalyan after placing eleventh in the short and second in the free.

[1] Cui began her season on the JGP series, placing fifth in Linz, Austria, and then seventh in Ostrava, Czech Republic.

Because both Harrell and gold medalist Alysa Liu were ineligible for senior international competition, Cui was also assigned to the 2019 Four Continents Championship.

[9] On October 9, 2019, Cui announced that she had reinjured her ankle in training and would consequently withdraw from her Grand Prix assignments for the year, the Internationaux de France and NHK Trophy.

Cui struggled with continuing ankle issues and developed an eating disorder that hampered her recovery, though a skating friend helped her to begin improving her mental health.

[13] While appearing on Polina Edmunds's podcast, on an episode that was released in February 2021, Cui said she was training in Lake Placid, New York, with Paul Wylie and was still recovering from her injury.

[13] Competing at the 2023 Eastern Sectional Championships in early November, Cui would win the silver medal, which allowed her to qualify for the U.S.

[16] Although assigned to compete at the 2023 Winter World University Games, she would withdraw following a nineteenth-place short program due to illness.