Crystal Smith was just six years old when she was diagnosed with high-risk neuroblastoma in 2015. The "fiery and feisty" schoolgirl had been complaining of pains in her stomach and legs for the last year but various scans and tests discovered nothing.
Then in 2015 a blood test showed that she was severely anaemic, further investigations at Cardiff's University Hospital of Wales found that she had cancer. She was immediately started on chemotherapy, and received several rounds of radiotherapy and immunotherapy before ultimately being given a bone marrow transplant.
By 2017, she had gone into remission but just a year later, in January 2018, the cancer had returned. It was picked up at a routine scan, mum Sabrina Amor, 38, wasn't with her at the time as she was pregnant and restricted from attending scans for that reason.