Cancer may have affected the bones and lungs of a 19-year-old Dubbo woman, but it could not dampen her extraordinary spirit.

Since her osteosarcoma (bone cancer) was first diagnosed at 12, Molly Croft has raised more than $2 million for children's charities.

One of those was Ronald McDonald House, where she stayed for 292 nights while receiving treatment.

Her initial aim was to raise enough money to cover the cost of that accommodation, even though children receiving treatment stay for free.

"When I got home, I realised I had to find the new Molly," she said.

Molly Croft spent nearly 300 days in hospital for cancer treatment. (Supplied)

Her parents were a driving force in helping their daughter find the light in even the darkest times, including her second cancer diagnosis in 2021.

"Every night in hospital, my mum and dad would ask me what my rainbow was," Ms Croft said.

"I've carried that throughout my life, and every night I think about what my rainbow is.

"I can't believe that now those rainbows and that mindset have helped raise so much money for vital sarcoma research."

Molly Croft's sister, Maddi (second from left), became a special needs teacher after her sibling's diagnosis. (Supplied)

Ms Croft found purpose in raising awareness for deadly diseases that affected the lives of thousands.

In 2017, she founded The Tie Dye Project with netballer Amy Parmenter.

It creates and sells tie-dye products to raise funds for medical research and clinical trials.

"I found that's what I wanted to do, and I think I'm very lucky to say at the age of 19 that I have found my passion," Ms Croft said.

Amy Parmenter (left) and motivational speaker Molly Croft co-founded a charity together. (Supplied: Tie Dye Project)

Her mother, Angela Croft, said the family could not be more proud of her.

"She had the most beautiful, kind, compassionate grandmother, [and] I feel like she must channel her a bit," Ms Croft said.

"Her other grandmother, she didn't meet either, but she was a major in World War II, and a very strong lady."

Ms Croft said the effect cancer has had on her daughter's life was far from over.