Playing in the Dubbo sunshine with her sisters is one of the joys she has had to forgo in a battle for life.

The growing membership of Team Addi will acknowledge her loss of independence when it converges on CrossFit Dubbo in Carboni Court on Monday for a series of fundraising workouts.

Addi's supporters hope to be joined by children and adults keen to raise cash to cover the Knaggs family's travel expenses while she receives treatment at the Sydney Children's Hospital in Randwick.

Event organiser and fitness enthusiast Lisa Tratt will be on hand to offer advice that rings true in the light of Addi's diagnosis.

"When you don't have the choice to exercise and live your life the way you want, that's when you can complain," she'll say.

Mrs Tratt, a business partner and close friend of the Knaggs family, yesterday asked "everybody" in the city to flex their community muscles and be part of CrossFit in Pink.

She said all proceeds from the event would go to the Knaggs family because of the generosity and support of CrossFit Dubbo owner Duncan Stephens.

"I wouldn't have been able to put this together without the CrossFit team backing me all the way," she said.

"I know it's going to be a huge success."

Likewise, Mrs Tratt is positive that Addi can fight off fourth-stage neuroblastoma and come home.

"Addi is a tenacious, strong-willed, amazing little character," she said.

"She's defying the odds already."

Mrs Tratt told of Addi waking up from an induced coma, surprising her doctors.

"She's coped with the chemo well and doesn't get much sickness," Mrs Tratt said.

"The doctors say she is responding to the treatment better than anybody else."

But the little girl with a Team Addi banner above her hospital bed has hard yards ahead of her.

Mrs Tratt said she would undergo a bone marrow transplant before Christmas, requiring six weeks of isolation.

Only mum Kelly and dad Mark will be able to see her.

Addi has been receiving treatment in Sydney for two months after falling on a family holiday, leading to the discovery of many tumours.

Mrs Tratt said Addi and Mrs Knaggs returned home to Dubbo for a couple of days last week.

"But Addi's still got five months of treatment to go, if everything goes well," she said.

Mrs Tratt said the Knaggs family was "staying strong" for Addi, but was experiencing "huge" emotional and financial stress.

Monday's fundraiser will run from 10am to 2pm, with individual and team workouts costing $10 and $20, respectively.

Drinks and a barbecue brunch and lunch will also be on offer.

Donations will be "kindly accepted".