The heirs and great-grandchildren of Samuel Hartveld will receive the work.
A statement on the writer’s website said she died peacefully after a ‘long bout’ of illness
The girl group of Lauren Byrne, Holly-Anne Hull and Charlotte Steele will represent the UK at the competition in May in Basel, Switzerland.
Her father Johnny Ball shared an update on his 54-year-old daughter three months after she left her BBC Radio 2 programme