"We are greatly saddened by her death. Our thoughts are with her family at this time." The store was closed yesterday out of respect for the woman, her family and colleagues, he said.
An ambulance spokeswoman said the service was called at 4.56pm and told a woman was not breathing after suffering a suspected asthma attack.
Ambulance officers had performed cardio-pulmonary resuscitation (CPR) and the woman was taken to Christchurch Hospital, where she died.
The Asthma Foundation says someone dies every week in New Zealand from asthma.
In 2011 - the latest year for which figures are available - 69 had died. More than half a million Kiwis had the respiratory condition, including one in seven children and one in nine adults.