Freya's moving entry, "The Letter" was selected ahead of 6,000 entries from across 39 local primary schools.
The Letter, from a young soldier to his younger sister, tells of his experience on the front line, of his fear and longing to be back home with his family and sweetheart.
Freya and 25 other prize winners received their awards at the recent prize giving.
Presenting Freya with the Young Writer of the Year award author Emily Dodd said:
"Freya's piece was moving, capturing the authentic voice of Arthur, a young man who was grappling with the emotional pain of being at war as he wrote to his sister back home. It is an honour to present Freya with such a well-deserved award. I look forward to seeing her work in book shops one day. I wish all the winners the very best of luck and hope to read more of their stories in the future."
Emily also entertained the audience with her story The Grouse and the Mouse, inviting children from the audience to join her on stage and the guests in the auditorium to mimic the actions of the animals involved. She also spoke of her experiences from her first attempts at writing stories at school to becoming a published author. Her truly inspirational message was the importance of being yourself and never give up you can achieve many things.
Executive councillor for culture and leisure, Dave King added: "I would like to say a huge thank you to everyone involved with Young Writer. It's extremely rewarding programme for our young people and our schools, and such a great event."
The event, organised by the council's Library Services aims to encourage creative writing, promote reading and reward effort. The judges were S6 students from James Young High School who had the very difficult task in selecting just 26 prize winners.
The Awards ceremony provides an opportunity to showcase and celebrate the achievements of all of West Lothian's Young Writers.
The young writers' work is published in a special booklet and a copy is sent to each primary school and is also available from any library in West Lothian.