"I don't want my story to be a sob story. I want to raise awareness & make a difference," she told Sunrise hosts Sam Armytage and David Koch on Monday.
The Adelaide school girl says she is now a "happy and healthy" 17-year-old in year 11 who loves dancing and sport.
However, her mum Meghan admitted that "with every check up there's also fear".
"To go from stomach ache to diagnosis in a very short space of time like that was quite devastating," she said.
More than 1,600 women are diagnosed with ovarian cancer each year while one woman dies every eight hours.
To learn more about Jemima's story and what to keep an eye out for, watch the video above.
Find out more: http://www.ocrf.com.au