Risk of not having a job? Get a job before you come (which might actually be needed, depending on visa type). A little research should show if there are jobs she would enjoy.
Or risk of being attacked by our famous deadly fauna?
Seriously people here are not worried by spiders. A little bit by snakes. But most people wouldnt see a snake.
Im more worried by ants (we do get big bastard ants that could wrestle you, or ones that hurt like hell if they bite)
Or grass!! Yes we have spiky grass that hurts to walk barefoot on. Called bindis (yes bloody Steve Irwin named his daughter after a grass). Id say more city people are worried about attacks of killer bindis that a croc or a shark.
Or the sun - you will find out people do worry about skin cancer. If you are very fair skin it could be an issue if you are also outdoors types.
Australia (or NZ) are also not that different that its a total culture shock. Close enough that you notice the differences, because much of the time it can feel the same and then something jumps out as different.
Now is definitely not the time to do it.
But maybe the time to look into doing it in 6 months or a year.
Heck whats the worst that could happen (well apart from shark attack!) - you come, hate the place, the people, the job - and you go back.
Or maybe you will enjoy it. Even if its just a year and you go back with a great experience and maybe a different view of life (and say "no worries" a lot)