The mother critically injured in a balcony collapse in the Brisbane suburb of Ascot yesterday has this morning lost her fight for life.



The woman, 48, was in the intensive care unit of the Royal Brisbane Hospital when she passed away, a police spokesman said.



The balcony on the house in Upper Lancaster Road collapsed during an end of Year 12 mothers' luncheon about 1pm.



As many as 70 women were attending the annual function when the balcony plunged to the ground, injuring 25 people and trapping several.

Operating theatres were immediately placed on stand-by yesterday afternoon, ready to receive casualties, and intensive care beds were reserved for those requiring immediate and post-operative treatment, the spokeswoman said.

The collapsed balcony at the Ascot house. Credit:Scott Casey.

Two other women were taken to the Princess Alexandra Hospital with serious injuries and 12 others described as "walking wounded" were taken to the Mater Hospital for observation and treatment.

Police, fire and ambulance crews which swarmed the scene this afternoon cordoned off Upper Lancaster Road and medicos set up a makeshift clinic underneath a tent on the front lawn of the replica Queenslander house to treat the injured.