I regret her death while backpacking in the (always hostile in summer!) Australian Outback. I hope her family recovers from her loss.
But.
If she died by drowning (submerged under water), then what kept her in the water, or what pulled her underwater and then kept her under?
Dies by exhaustion swimming away from a danger onshore?
If her corpse was mangled by dingoes, then could they get to her body if it were trapped underwater?
Even if her body refloated after death, were other predators involved -including potentially human?
Got tired, got a cramp, dove in and hit the water wrong any number of things can happen. That is why it is generally considered wise to have a swim buddy.
She didn’t drown.
The drowning could have been due to simple mishap, a rip current, undertow, or even a toxic reaction to venom from a jellyfish sting or the like. Her body would have naturally floated and could have easily been drawn ashore by wave action.