Fellow student Grace Mawson has been working hard on set movement and building, and will oversee one side of the stage during the shows.
"I'm just happy to be a part of it." Had the Covid-19 lockdown not kept her from the theatre, she said, "I wouldn't have learned everything I have and had the opportunities to build all sorts of props," she said.
The role has reaffirmed her dreams of becoming a high school music teacher.
The two students are "definitely there for their talents", operatic society secretary Sonya Aifai said.
"Abby has a beautiful voice and fitted the role of Frenchy beautifully and Grace has a natural talent for stage crew work and throws herself into it completely."
Sacred Heart College principal Maria Neville-Foster said she was very proud of the students' achievements.
"It's lovely seeing our students getting involved in the community. As a Mission Sister school, our belief is that we give back to the community and we share our talents that were given to us from God with the community," she said.
The cast is looking at re-starting rehearsals in July for a re-scheduled August opening.