One of the men in the group, understood to be the distressed woman's husband, came out of the water when Thirlwell approached him.
''I just initially spoke to her husband. He said she was a strong swimmer.''
Then, the other male in the group came out of the water.
''[He] said 'she's stuck out there'.''
Thirlwell ran into the surf and swam with the woman's husband to try to rescue her.
Hughes said the woman swallowed quite a bit of water.
''At one point she was under.''
When Thirlwell and the woman's husband dragged the distressed woman out of the water, she could barely walk.
The rescue was over pretty quickly, Thirlwell said.
''She was hysterical. She was in shock,'' Hughes said.
Emergency services were called about 11.20am.
A police spokeswoman said when police arrived the woman was already out of the water and had been walked to the ambulance by Fire and Emergency New Zealand personnel.
A St John spokesman said the woman sustained minor injuries and was assessed and treated at the scene.
Thirlwell said the beach was ''pretty deceiving''.
''It looks significantly calmer [than other beaches].''
Hughes believed there should be a sign warning visitors of the dangers at the beach.
Locals knew the risks but freedom campers often did not realise it was not particularly safe for swimming, she said.