At the 2008 Olympic Games, Quah failed to qualify in the heats of the 400m Individual Medley event but set a new national record (4:51.25).
2009 Asian Youth Games
Quah was Singapore's flag bearer for the 2009 Asian Youth Games.[7] She won three individual gold medals in the 50 m, 100 m and 200 m freestyle events while setting national records for all three (25.43, 55.57 and 1:59.21).[8] She won the team gold and bronze medals in the 4 × 100 m freestyle relay and 4 × 100 m medley relay events, respectively.
2013 FINA Swimming World Cup
Quah set a new national record in the 200 m freestyle event in the second leg of the 2013 FINA Swimming World Cup, held in Berlin, Germany. Her new timing of 1:58.80 was 0.09 seconds faster than Lynette Lim's three-day-old record of 1:58.89.[9]
Southeast Asian Games
Quah has represented Singapore and won, at the following games: