The talkative 12-year-old has written and published a book, ridden a horse, water-skied and now will trek to the top of Australia's highest mountain.

But Chelsea's biggest achievement to date has been never letting a disability stop her from achieving her goals.

In August last year The Chronicle reported on the launch of Chelsea's first picture book, A Hippopotamus in the Sink.

Now the Banks student will put her physical and psychological stamina to the test by taking part in an 18.4-kilometre trek to the summit of Mt Kosciusko and back again.

The Cerebral Palsy Alliance's inaugural Krazy Kosci Klimb will see 18 adolescents with cerebral palsy take part in the eight-hour challenge this weekend.

The event is the brainchild of 14-year-old Hannah Diviney to prove that having a physical disability doesn't have to stop anyone from achieving their dreams.

Chelsea, who has just started year 7 at Mary Mackillop College, was chosen from among almost a thousand applications to take part in the climb.

The organisers hope to raise $150,000 to cover the cost of the climb and support the alliance's sport and recreation programs for children and teenagers.

“I'm feeling a bit nervous but also excited,” Chelsea said.

“I'm excited to find out what people with cerebral palsy can do. I can prove to people I can do things and can do them quickly.”

Chelsea, who is an ambassador for the Cerebral Palsy Alliance in Canberra, will be joined by her eldest brother, Jake, and eldest sister, Tara.

Her therapists have modified a manual wheelchair for the climb, which will be attached to Jake and Tara via a harnesses and a pulley system to ensure weight is evenly distributed when carrying Chelsea through difficult terrain.

Jake said he was excited to take part and looked forward to breaking the trio's challenge of completing the loop in less than eight hours.

“It's a once in a lifetime opportunity to go and have a look up there,” he said.

“My two younger brothers are fitter than I am [so] I have been training a bit for it – trying to get fitter and eating healthy. Chelsea's not very heavy so I think we can manage it.”

Chelsea's mum, Leah, said the three-day trip would be a great opportunity to meet other families who had been touched by cerebral palsy.

“I think it will be invaluable for our whole family,” she said.

“As a parent the best person you can talk to in regard to your children is another parent. She lives with this every day. To talk with and listen to other families will be the best.”

But Chelsea's goals won't be over once the climb is completed and the Bouldings are back on home soil.

The author has another picture book due for Australia-wide release in June and is currently finishing her first novel.

Her debut book, A Hippopotamus in the Sink, has sold 600 copies in the ACT alone – just 400 books shy of a bestseller.

But we'll have to wait to find out what's in store as Chelsea was unable to elaborate anymore.

“I'm so sorry but I can't tell you the details,” she said.

For more information and to support the Krazy Kosci Klimb, visit www.krazykosciklimb.com.au