What is She'll Be Apples?
1.
Aussie slang for 'All's well', 'It'll be alright'.
also
Sally: What if something goes wrong?
Brooke: She'll be apples!
See
2.
Australian slang for "It will be alright"
"Ah no worries, she'll be apples!"
meaning "Don't worry, it will be alright"
See