Olivia touched the nation's hearts after she flew to Mexico to receive treatment for neuroblastoma, an aggressive form of cancer.
But while she was there, the little girl, from Fraserburgh, Aberdeenshire, became seriously ill.
In a desperate race against time, her mum Lauren and dad Steve, and the charity Families Against Neuroblastoma (FAN), set about raising £110,000 to fund the cost of the expensive medical equipment and care Olivia would need to get her home.
They set up a JustGiving page and donations flooded in, with more than £150,000 being pledged by kind-hearted well-wishers.
Olivia was diagnosed in January 2009 after suffering from severe backaches and tiredness.
Following visits to local GPs she was taken to Royal Aberdeen Children's Hospital and diagnosed with stage four neuroblastoma.
FAN said Olivia had a tumour the size of a grapefruit in her stomach. Neuroblastoma is a cancer of specialised nerve cells and can occur anywhere in the body.
Fewer than 100 children are diagnosed with it each year in the UK, and most who suffer from it are younger than five years old. Olivia touched down at Aberdeen Airport yesterday.
A spokesman for Air Ambulance Worldwide, which transferred Olivia, told the Press Association: "The flight has landed. Our indications are that the flight went well. All the reports were that she was doing fine."
FAN said on its Facebook page: "Once again, thank you to everyone who has made Olivia's trip home a reality, we couldn't have done it without the generosity and spirit of the public.
"Lauren and Steven are overwhelmed by the public support, as are we."
Let's hope she is now comfortable at home and surrounded by her family.