Hey,
I have exactly the same problem as your friend as I was born with a cleft, which means my nose looks completely different from some angles than it does from others. And I have one nostril bigger than the other. I promise it doesnt look as hideous as it sounds haha.
Everyone I've spoken to on here and on other sites and forums have told me that it isnt bad enough to be a problem for an airline and I'm hoping to work for Emirates. The other day I was at the hospital for a routine check-up and when I was speaking to the doctor, I told him about my Emirates dreams but I wasn't sure if I would be able to because of the cleft. He told me that last year he did part of the medical for someone who had been accepted to Emirates with a cleft and nose much worse than mine.
So if an uneven nose is not a problem for an airline like Emirates, I dont see how it would be a problem for an Australian airline.
To be honest, I think that if your friend has a nice smile and good skin, her nose wont make a difference.