Olivia and her mother, Kim Carr, would leave for Auckland on Sunday and rehearsals would begin on Monday.
"I'm excited but a little bit scared to leave everything - my friends and home," Olivia said.
She had been a lover of musical theatre and always looked at the young kids performing in them, wishing it might be her up on stage one day.
Auditioning for Billy Elliot was spur-of-the-moment, coming about when Olivia and her younger sister were in Auckland during the school holidays for a dance workshop.
When Olivia's mother Kim Carr found out there were auditions for the musical she thought 'why not'.
The family remained in Auckland to see what might happen and when Olivia got a call back the following week she had to show off her acting and singing chops.
"It's an amazing opportunity. She's had to give up a lot to do it, her friends, sports, teachers," Ms Carr said.
Olivia would miss the last four weeks of school this term. Next term she would be at Albany Junior High, studying by day and performing by night.
Olivia's ballet teacher Heather Mead said she was extremely proud and would miss her.
"All of her teachers, tap, music, and myself, everybody has put input in, like building blocks and we've ended up with a great result. Plus Olivia always puts in 100 per cent.
"She's very dedicated," Ms Mead said.
The show opens on October 7 at Auckland's new ASB Waterfront Theatre.