"I never expected to win or even become a finalist, after already making the finals of this year's Play It Strange Peace Song competition.
"I'm so happy and very grateful."
Mike Chunn, former bass player of Split Enz and CEO of Play It Strange, said Grace was no stranger to the music awards. She was twice a finalist in the organisation's Peace Song Competition, and a finalist in the 2021 Lion Foundation Song Writing Competition.
"With her winning song this year, Grace has reached an engaging and varied lyric and musical standard. She is a natural and her future is bright."
The Lion Foundation Songwriting Competition is the trust's flagship songwriting competition. This year it attracted 352 entries from Years 9-13 across the country.
Following the school presentation, Grace performed the coming-of-age song titled Differently Now, to the assembled students and teachers.
"I couldn't have asked for more support from my teachers, and St Andrew's College, over the last five years," she said.
"They are incredible and I wouldn't be able to do it without them."
Grace has been a prolific songwriter on piano and strings, and utilised synths and drums to create a more electronic sound, said St Andrew's College Head of Music, Duncan Ferguson.
"We are incredibly proud of Grace."
The multi-talented musician, songwriter and performer has achieved great success with her music, winning the 2021 New Zealand Chamber Music Contest as a violinist in the St Andrew's College trio, Vich Perfect.
She was also the concertmaster of the New Zealand Secondary Schools' Orchestra and has had several lead roles in St Andrew's College productions.
St Andrew's rector Christine Leighton said Grace's creativity was an inspiration to many other students.
"As a head prefect this year she has balanced many responsibilities and commitments. It was fantastic to surprise her with this award in our Cultural Assembly, which I know will mean so much to her."
The winning song will feature on the 2022 Play it Strange album, and Grace will perform it at the annual Play it Strange Awards, to be held in Auckland in November.