Garland stayed in Kaohsiung, living with her aunt, to pursue tennis and continue her schooling, as well as competing on the ITF Junior Circuit in Asia.

[6][7] Garland reached the quarterfinals of the 2018 French Open with wins over Gabriella Price, Viktoriia Dema, and Zheng Qinwen before bowing out to Leylah Fernandez.

[9][10] At the 2018 US Open, she reached the semifinals of the girls' doubles alongside Moyuka Uchijima but they lost to Coco Gauff and Caty McNally.

[12] In October 2020, she beat Katie Boulter to win her first professional title, at a $15k event in Sharm El Sheikh.

[13] In August 2022, Garland won her first $25k level titles with victory at tournaments Foxhills in Surrey, England and Aldershot.