I te tau 2019, i whakataetae a Manumua mo Tonga i te Oceania Weightlifting Championships i te waahanga wahine + 87 kg. I whakauruhia e ia te tuarima o nga waahi i te tangohanga, i te hiki 80 kg. I uru hoki a Manumua ki te 2019 World Weightlifting Championships
, e tohu ana i a Tonga i te roopu wahine +87 kg. I whakaarahia e ia te 96 kg i te tangohanga me te 115 kg i te horoi me te pupuhi, ka tu i te 19th.