Nieh made her own swimming history, as a 16-year-old teen, at the 2004 Summer Olympics in Athens, where she competed in the women's 50 m freestyle. Swimming in heat five, she posted a lifetime best of 27.09 seconds to pick up a fourth spot, but trailed behind Puerto Rico's Vanessa García by more than a second. Furthermore, Nieh tied for forty-first overall with Hungary's Zsuzsanna Csobánki in the prelims.