"I know if I've missed a week, I definitely feel it," she said.
Sarah will receive her second treatment in two weeks' time - at which point the drug may be coupled with a funded chemotherapy, Folfiri, which was previously unsuccessful on its own.
The chemotherapy caused Sarah night sweats and her hair to thin.
"If it's meant to work then that's the least of my worries," she said.
The gutsy massage therapist was resting in preparation for two fundraising events organised by friends and supporters. Ride out for Sarah is a horse trek event being held today with entry fees and sausage sizzle proceeds going towards her treatment.
Tomorrow at 2pm, Mount Brewing Co will host Karma Keg where punters can purchase beers for the amount they would like to donate to Sarah's treatment fund.