A Queensland Boating and Fisheries patrol vessel is also on site this afternoon to stop people from swimming where two people were attacked.
The incident occurred within 24 hours of an attack on a Tasmanian women in the same area.
"Paramedics are treating a female child in a serious condition with a significant leg injury", Ambulance Queensland said, without providing further details.
Less than a day earlier a 46-year-old woman was bitten at the same location. The shark bite left her bleeding profusely, the report said.
The woman was transported by helicopter to Mackay Base Hospital where she remains in a critical condition.
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The young girl, believed to be from New Zealand, was airlifted to hospital where she underwent emergency surgery on Thursday night and continues to fight for life.
Dramatic footage of the second life-saving shark attack rescue mission in as many days in the Whitsundays has been captured by a helicopter paramedics' body-cam. Of these, two people died.
The measures aim to reduce the overall number of sharks in the area, but do not provide an impenetrable barrier between swimmers and marine life.
Barwick was badly hurt on the upper right leg, said a doctor who assisted at the scene.
"She did suffer a lot of blood loss".
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It's understood she was bleeding heavily from the leg injury when she was pulled from the water.
"She was then treated by a doctor who was on the yacht before crews arrived, where she was transferred to a smaller dinghy and then winched by the helicopter".
"She really was incredibly lucky".
Ms Barwick works for non-profit Family Based Care in Burnie and had travelled to the Whitsundays on a holiday with her husband Craig and friends.
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