The 2003 Afro-Asian Games provided her an opportunity to compete against top African opposition. Winatho was her region's best performer in the 400 m – taking the bronze medal behind Estie Wittstock and Doris Jacob – and won a second bronze in the 400 m hurdles. Another hurdles bronze came at the 2003 Asian Athletics Championships in Manila. Her final competition of the year was the 2003 Southeast Asian Games. Her attempt to retain her titles failed as she did not start the 400 m final, but she won silver in the 400 m hurdles behind Malaysia's Noraseela Mohd Khalid and anchored the Thai women's 4×400 metres relay team to the bronze medal.