[7] Bai won the women's 2019 IBSF World Under-21 Snooker Championship in Qingdao with a 4–0 victory over Mink Nutcharut in the final.

[12] Accompanied by her mother, as she was unable as a 16-year-old to travel alone, she competed in the 2019 Hong Kong World Women's Masters, where she lost 1–4 to Rebecca Kenna in the final.

After coming from 0–3 behind to defeat Evans 5–3 in the semi-finals,[20] Bai secured her first women's world title with a 6–5 victory over Mink in the final.

[22] Bai became the first woman since Kelly Fisher in 1999 to win back-to-back matches at a ranking event when she defeated Farakh Ajaib and then Jamie Jones in the qualifying rounds for the 2024 UK Championship.

[23][24] She then became the first female player to register three wins at a ranking event by beating Scott Donaldson in the next round in a match which went to a final frame decider.