PC 172 Sanchez confirmed that the female driver was the only occupant in the blue Mini when it crashed in the early hours of this morning on Les Banques, St Peter Port.
'Nearby residents heard a loud bang and called the incident in at about 1am,' he said.
All three emergency services were called to the scene.
'We suspect that the driver was coming from the direction of Town along Les Banques.
'There are scrape marks on the pavement and the bus shelter has been taken out completely.'
A lamp post was also hit and damaged.
The road was closed to all traffic from the roundabout by the Red Lion pub to the traffic lights at Admiral Park.
It appeared to PC Sanchez that the driver had bounced off the bus shelter and ended up in the middle of the road.
Her injuries were not believed at the time to be life-threatening.
Guernsey Fire & Rescue Service station officer Danny Joyce said firefighters were called to the scene at 1.07am.
'When I arrived I could see that the bus shelter had been completely destroyed,' he said.
'We believe the car was travelling from the direction of Town, lost control for whatever reason and hit the bus shelter.'
On arrival, firefighters were prepared to provide fire cover, but this was not necessary.
They assisted colleagues at St John emergency ambulance with removing the female driver from the vehicle.
'There was no cutting away of any of the vehicle necessary, the casualty was assisted out of the driver's side door,' he said.
Staff from Guernsey Electricity attended because a lamp post near to the bus shelter had been damaged and the light fixture was hanging loose.
Firefighters helped to ensure both the electricity line and pavement was safe for when the cordon was lifted and the public could pass through the area again.
After police officers marked up the vehicle on the road, a tow-truck was called to remove the vehicle and States Works arrived to clear up the area.
Some officers followed the ambulance to the Emergency Department to check on the welfare of the driver and continue the investigation.
Any witnesses of the crash are asked to get in contact with the police on 222 222.
PC Sanchez added: 'We're also keen to speak to anyone who had witnessed the vehicle driving before the collision, likely in the Town area.'
The vehicle was a blue mini.