"THERE was never in a million years that I thought my daughter would have a brain tumour."

But, around two months ago, that nightmare became Tamara Redmond's reality.

Her 15-year-old daughter, Billie Fitzpatrick, was diagnosed with a high-grade glioma, an aggressive form of brain cancer.

The night in late August started like any other for the family.

"Billie was fine, literally giggling with me two hours before this happened, and then our lives just got turned upside-down," Ms Redmond said.

At around 10pm, Billie voiced to her parents that she wasn't feeling well.

Nauseous, and seeing flashing lights, Ms Redmond quickly sprang into action to fetch her daughter a bucket and some medicine.

"The next minute, she went into a full grand mal seizure," Ms Redmond said.

"She went completely blue; she was gasping for air because she was choking on her own saliva.

"The time felt like it just stopped, and there was literally nothing I could do to help her, or take away her pain."

Billie was then rushed to Bathurst Base Hospital.

There, she underwent routine testing, including a CT Scan.

The results were worse than Ms Redmond could have ever imagined.

"The next day, we found out there was a brain tumour," she said.

That moment was one of the worst of Ms Redmond's life.

"We were just petrified for her, and for what we were about to undergo," she said.

In the days following her diagnosis, Billie was sent straight to Westmead Hospital, where she underwent emergency brain surgery to remove as much of the tumour as possible.

Following the surgery, Billie was required to remain seated at a certain level to ensure the drain in her brain was at the correct angle.

Now, she is almost five weeks into six weeks of radiation, for the duration of which Ms Redmond and Billie have been staying at the Ronald McDonald House.

They've been away from Billie's younger brother, her older sister, and her dad.

But despite missing her family and the negative side effects, Billie is handling the treatments better than Ms Redmond could ever have expected.

"She's just a trooper; absolutely blown us out of the water, she has," Ms Redmond said.

Despite Billie starting to lose her hair and experiencing fatigue, Ms Redmond said that she has retained her sense of adventure through the process.

A farm girl at heart, Billie is fighting with everything she has to get back to the property at Rockley, back to her horse, her dogs, family and friends at Kelso High School.

This strength that Billie has shown throughout her whole cancer journey has been a saving grace for Ms Redmond.

"She's keeping us strong. If it wasn't for her, I would be a basket case," she said.

"She just looks at me and says, 'Mum, if you get sad, then I'll go down', so she is keeping us strong."

Once the six weeks of radiation have ended, Ms Redmond said the family will be heading home, where Billie will undergo another MRI to determine the success of the treatment.

Then, following the six rounds of radiation, Billie will have to attend regular follow-up appointments in Sydney.

For these appointments, Ms Redmond will have to continue to take time off work to assist Billie with her treatments.

Due to the mounting medical costs, compounded by the current cost-of-living crisis, a bank account has been established for the family.

This bank account has been organised alongside a Facebook page, Billie's Fight to Beat Brain Cancer, where regular updates on Billie's journey are being posted.

In addition to this account, The Rockley Bulls will be hosting a fundraiser on Saturday, October 25, at the male and female rugby grand finals at the Rockley Sports Grounds.

So far, more than $5000 has been raised for the family, for which Ms Redmond said she was extremely grateful.

"We really just want to say thank you, especially to the Rockley community, but also for all those who have donated, and all the phone calls and messages, and for keeping her in your prayers," she said.