Seems odd to me that her friends didn’t hear anything.
If she had been attacked by dingoes there would have been lot of noise.
Since K'gari (Fraser Island), a UNESCO World Heritage-listed wilderness area, offers a range of accommodations tailored to different travel styles, from rugged camping to luxury resorts.
They may have been at the place where they were staying. If she actually died from drowning, then it's unlikely that she was never even capable to scream.
A person that is in the process of drowning and is unconscience but not dead, does not recover without help.
At our neighborhood pool, we were watching a guy swim laps underwater in the diving area of the pool, and all of a sudden we was still moving his arms but it was in slow motion. He was doing this for a friend of mine who was a liscensed scuba diver. He was putting him through a test one must take to qualify to get a liscense. When he went into slow motion mode, we initially thought he was showing off. I finally pushed my friend in telling him he needs to rescue him, he's in trouble.
The male lifequard freaked out and said I can't do this, give mouth-to-mouth resuscitation because he was purple. I can't remember who stepped in to provide it. Fortunately that person, that I believe was a young female, was able to bring him back.
He had actually passed out, drowned, and brought back before he died.
Trust me, he was for all puposes very near death, amd was totally unaware of his condition, surroundings, etc.
Which would explain that she never even realized the dingoes were biting her. That wasn't going to make her regain consciouness either, for the drowning process must have not reacged death at that point.