Competing for Thailand internationally, Minpraphal broke national records in the backstroke, butterfly, and medley double. When her nation hosted the 1995 Southeast Asian Games in Chiang Mai, she won a total of five medals: four golds each in the 100 m backstroke (1:04.87), 200 m backstroke (2:19.02), 200 m butterfly (2:15.60), and 400 m individual medley (4:54.24); and a silver in the 200 m individual medley (2:19.88).