She was one of three people in an Alfa Romeo which crashed at Bel Royal at around 2.30 am.
The vehicle is understood to have hit a lamp post and mounted a grass bank before coming to rest back on the road. The vehicle was badly damaged and debris was strewn over a large area.
The three occupants of the vehicle were helped at the scene by members of the public before the emergency services arrived.
The police say that the driver was arrested at the scene on suspicion of drink-driving and other traffic offences.
The Avenue was closed to traffic for several hours from Bel Royal to Rue du Galet as inquiries were made and debris cleared.
The police are appealing for information from anyone who may have witnessed the accident.
• Full report in Monday’s JEP
