In 2019, Manumua competed for Tonga in the Oceania Weightlifting Championships in the women's +87 kg category. She placed fifth place in snatch, lifting 80 kg. Manumua also took part in the 2019 World Weightlifting Championships, representing Tonga in the Women's +87 kg group. She lifted 96 kg in snatch and 115 kg in clean &amp; jerk, placing 19th.