This week the Toy Show star celebrated the release of her charity single 'Sing for Saoírse' and went on a surprise trip to London.
Though this is an exciting time for her and her family, when they got home the family received heartbreaking news as the results of her recent CT came in.
Sharing a picture of Saoírse wearing a red beret, her mother Roseanne updated her Instagram followers about the youngster's health.
"It’s been a week of highs and lows in our household this past 7 days," she wrote.
"Starting with a gorgeous surprise family trip to London for the girls, the release of Saoírse’s charity single 'Sing for Saoírse' and the excitement and nostalgia of the pending Toy Show tomorrow night.
"Unfortunately along with the excitement we received some devastating news yesterday at Saoírse’s review. It’s been three months since her last review and while her tumour in her left lung is relatively static, yesterday's CT scan shows her cancer has now spread to her other lung."
Roseanne continued: "This came as a huge shock to us as Saoírse has been doing so well. In just six more days it will be 4 years since her journey with cancer began.
"4 diagnosis in 4 years is very hard to take. While we are still trying to process this new information, the show must go on.
"Saoírse is the bravest soul we know and her one and only request on hearing this heartbreaking news last night was to put up the Christmas tree.
"So that’s what we are doing, putting up the decorations ahead of tomorrow’s toy show."
Many of their followers were heartbroken to hear about her cancer spreading and they sent messages of love and support to the family.
One person said: "So terribly sad to read this. Will continue to pray for Saoirse every day. I hope she has the best night watching the Toy Show tomorrow."
A second commented: "Omg the poor child...so much ....I will be sending the angels to help her love to you and strength."
