A witness told the Herald two nearby medical students were first to run to the woman's aid.
The man, who did not want to be named, said they performed CPR on her for 20 minutes before lifeguards arrived.
"It was a long effort, huge effort. Especially those two young med students, they just went for it. Unbelievable.
"They were working on her for a good 20 minutes before emergency services arrived.
"Then the Surf Life Savers came over the bar, they came in at 100 miles an hour. They were all down there, then the ambulance arrived."
He said the medical students deserved a medal for the "serious work" they put in.
The man understands the woman ended up in the water as a result of the medical event.
He said the death was upsetting for those involved.