"I had butterflies in my stomach. It's awesome," she said.
She enjoyed writing songs in her spare time, she added, and writing this one had not been "too hard".
Kaitaia College head of music Lisa Chuck had used the competition as a class exercise, her students having three lessons, and homework assignments, to work on their entries.
Mr Russell also announced that Javia was invited to perform her winning song at Kaitaia's civic Anzac service, which left her a little nervous.
"We'll help her work on it in class, and maybe get a few fellow students to perform it with her on the day," Mrs Chuck said however.
Meanwhile Tuesday's audience included Javia's proud mum Shona Stephens, who nipped away from work to see the presentation.
"It was so hard to keep it secret from her. I'm so proud," she said.