The bus was carrying 53 members and supporters on a fund-raising trip from Mailefihi Siu'ilikutapu College on Vava'u, Tonga, when it crashed.
The group had been heading to Gisborne's Wesleyan Methodist Church for a performance.
RNZ reports a Tairawhiti District Health Board spokesperson said it understood a 55-year-old woman, who was transferred from Gisborne Hospital the day after the crash, had died.
