[TexasGator]

“The autopsy showed that she died by drowning, “

Nope.

“with the dingo bites being post-mortem.”

Some post-mortem. Others defensive.

“At most, the dingoes might have forced her into the water.”

Possible

“Yet she would have the advantage over such land predators in just a couple of feet of water so as to be invulnerable to attack if they went into the water after her.”

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June 2023: A ten-year-old boy is attacked and dragged to the water by a dingo which then attempts to drown the boy by holding his head under the water but the boy is rescued by his 12-year-old sister.[23]

September 2006: A four year old girl is bitten on the stomach by a dingo as she played in shallow water near Eurong.[41]

Wiki

[Rockingham]

My reading of the article was to the effect that the autopsy finding of water in the lungs and the surrounding facts most strongly supported drowning as the cause of death. That in another attack "the boy is rescued by his 12-year-old sister" seems to validate my point that a female adult in water ought to have a superior advantage against dingoes.

The natural strategy for an alert adult under attack would be to retreat to water deep enough to force the dingoes to swim. At that point, any that came on to attack could be drowned by shoving them under water. Racoons are known to drown pursuing dogs in a similar manner by forcing the dog's head under water.

One can imagine the victim being menaced or attacked, then retreating to the water, but losing her footing so as to suddenly inhale water and drown. The dingoes then inflicted the post-mortem wounds. Or maybe she drowned due to a toxic sting of some sort, with her body then attacked by the dingoes.