With everything going on at home, it was a big deal for Petra to leave it behind for a week.
Her sister, Rowan, has been in and out of hospital over the last ten years. She was diagnosed with neurofibromatosis type 1 and a brain tumour at three, relapsed a few years later, and later diagnosed with a foot tumour.
As a result, she had to learn to walk again, and her recovery has been blighted with medical issues like shingles, sepsis, and multiple fractures.
Their mum, Beth, says it meant Petra was left to get on with things.
“It was very difficult during those years to make any kind of plans. If we tried to go away on a holiday, our plans often had to be changed and cancelled at the last minute," explains Beth.
"Medical treatment like Rowan’s meant that there was a lot of uncertainty. This undoubtedly impacted on the other children.”