Emergency services were called to Kiddies Campus, off York Pl in central Dunedin, about 1.30pm.
Acting Sergeant Graham Perkins said he understood the woman had received ``seatbelt-related injuries'' after her car went through the fence, landing in the car park of a neighbouring business.
There was minor damage to the vehicle and to another vehicle in the park.
Police said the woman was in her 50s or 60s.
Sgt Perkins said it was possible the crash was caused by the driver pressing the accelerator accidentally.
-By Elena McPhee