She will shave her head for two of her aunties who have been diagnosed with cancer - Bomaderry's Robyn Florance and daughter, Michelle Florance, a former Bomaderry High student who now lives in Sydney.

Michelle, 49, who went into remission for bowel cancer diagnosed in 2016, is now suffering from cancer in her lungs and liver.

Less than a month ago, her mum Robyn was diagnosed with breast cancer.

With that, Chili, who had been trying to convince her dad to let her shave her head for cancer for years, finally got the go-ahead.

The 11 year-old Minnamurra Public School student has already raised more than $2000 for cancer research.

"I burst into tears when I heard Chili was doing it," Robyn said.

"It's gorgeous.

"I think she got the idea from my granddaughter in Shepparton, who had her hair cut off, and gave it to wigs for cancer. All this from our loving family, it’s just wonderful."

Robyn's prognosis appears to be positive after surgery and she will undergo radiation therapy in Nowra in upcoming weeks.

Michelle, who is undergoing chemotherapy at the Prince of Wales Hospital in Sydney, hopes to be well enough to travel to Minnamurra for the head shave on March 14.

To sponsor Chili and the Leukaemia Foundation's World's Greatest Shave, click on this link.

Chili's friends and relatives have left messages of encouragement, saying how proud they are.

Her mum, Cherie McGregor, is delighted at Chili's brave decision.

"I said to her, 'If they end up finding a cure one day, you'll know you've contributed,'" Cherie said.