Overview
- Bay developed sudden kidney failure at age two and was rushed to Great Ormond Street Hospital, where she was intubated in ICU and started on dialysis.
- She received a living-donor kidney from her aunt Mimi in August 2021, with post-surgical lymphatic damage that prolonged her hospital stay to December 2021.
- In December 2024 she was diagnosed with EBV-linked post-transplant lymphoproliferative disorder in the bowel after abnormal blood tests and gastrointestinal bleeding.
- An initial lower-dose chemotherapy plus immunotherapy produced only a partial response, leading consultants in 2025 to use an aggressive 10-cycle protocol reported as used roughly nine times in over two decades.
- A November 2025 PET scan showed no evidence of disease, and she has since resumed activities such as Brownies, chess and performing arts, with ongoing psychosocial support from Spread a Smile, which reports tens of thousands of bedside and virtual visits across NHS sites in 2025–2026.