Daisy O'Leary Pye, 12, from Lee, south-east London, was diagnosed with Hodgkin's lymphoma, a type of cancer that develops in the lymphatic system, shortly after shooting billboard and television ads representing the famous brands.
While modelling, the schoolgirl unknowingly suffered with a 16cm, grapefruit-sized tumour in her chest that was pressing on her lungs and heart, and hindering her breathing.
After enduring gruelling chemotherapy that saw her lose two stone and all her hair, the youngster is finally in remission but must still undergo further treatment to prevent the cancer returning.
Daisy's mother Jules Pye, who works at a production company, said: 'It was the news we were waiting for. She is truly courageous and I will be with her all the way.'
Ms Pye said: 'After a year-long battle this is the news we've been waiting for. The hardest thing for her was losing her hair, but she has been so, so brave. I'm very proud of her.'
Ms Pye first became aware her daughter was ill when they returned from a summer holiday in Ibiza.
She said: 'We'd been on holiday in August 2016 and by September that year, her condition had deteriorated.
'She was always so active and loved dancing, but I didn't know that she'd been sitting out of the warm ups to her class. She then started complaining about something pressing in her throat. She had trouble lying flat at night and couldn't stop coughing when she lay down. '
Ms Pye and Daisy's father Jimmy O'Leary, 53, who are separated, repeatedly took her to the GP before a diagnosis was eventually made.
Here are her photos as she undergoes chemotherapy.