RNZ reports the 26 year old managed a best throw of 19.56 metres with her third attempt, finishing one place above Florentina Hriscu from Romania.
China claimed the gold and silver medals with Yao Juan setting a new world record mark of 44.53 metres.
Samoa's other Paralympian, Alefosio Laki, finished 12th in the men's F37 Discus final last week.
Papua New Guinea's Joyleen Jeffrey trailed the field in the women's T12 200 metres heats but did set a season best time of 32.78 seconds.
