Gemma co-wrote the track 'Angel Rays' for the films soundtrack.
She does not sing the version on the soundtrack CD, it is performed by Sissel
However,Gemma does sing the song over the credits in the actual movie.

The time we lost, you’ve held your cross
No tears did your eyes tell
The time you lost, no matter what the cost
Your strength it saw you through

But time will heal what your heart conceals
And this I know too well
The road you’ve known that takes you home
Is waiting strong and true
For this child of mine
She’ll forever shine
Angel Rays watch over you

But time will heal what your heart conceals
And this I know too well
The road you’ve known that takes you home
Is waiting strong and true
For this child of mine
She’ll forever shine
Angel Rays watch over you

For this child of mine
She’ll forever shine
Angel Rays watch over you

Angel Rays
Angel Rays
Angels Rays

Angel Rays
Watch over you
Angel Rays