[Grisly post - skip this if you're squeamish]
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Don't blame the shark. It was only being a shark, and doing what sharks do.
The linked article doesn't say the gorey details, but if others were able to help her to shore and she was receiving aid when she died, chances are it wasn't so much a shark "attack" as it was a shark "what does this taste like?" curiosity bite. Sharks tend to "taste bite" things, and spit out what isn't a normal food source. Unfortunately for humans, that one bite can be fatal, because it usually comes on a leg or midsection, where we happen to have large arteries and organs that tend to bleed out pretty quickly. My guess is this is what happened to this poor woman.
If it had been a true "attack," the shark would have repeatedly bit hard and chewed vigorously, rendering the poor woman quite dead, right there in the water. My guess (unsubstantiated, of course), is the shark did a quick taste bite, and the woman reacted accordingly. Others helped her to shore (no way to know how far they were from her when she was bitten), where the sad ending occurred. This article says she was "wading in the water," but another article says she was swimming. It says "nearby kayakers" helped her to shore, so she was apparently in water deep enough to have paddlers around. The other article says Great White sharks are known to live along the coast there, and remains of a seal carcass was found on another beach, with a 19-inch bite radius, signs of a fairly large shark. White sharks feed on seals, who are often taken in the shallows right off the beach, when the seal is coming or going from shore. So my extrapolation is the unfortunate woman was just in the wrong place at the wrong time.
Still not enough details to really know the facts at this time, but my guess is that this was a case of mistaken identity - the shark did a taste bite, and moved on. The woman, sadly, did not survive.
Sad situation, all around. But not the shark's fault.
Dave