Police have appealed to the community for assistance as they continue with their inquiries into a fatal single motor vehicle crash at Harden four months ago.

About 2pm on Monday 19 January 2015, a 38-year-old woman was travelling with her three daughters aged 15, 12 and nine years old from Sydney to Young.

As their silver blue 2005 Nissan Pulsar sedan travelled north on Moppity Road at Harden and appears to have left the road and struck a tree.

The driver was trapped but the three children, who all suffered minor injuries were able to extricate themselves and alight from the vehicle. The children then walked some distance along Moppity Road where they flagged down a passing motorist who alerted emergency services.

Narissa Fox was treated at the scene and conveyed by air to Canberra Hospital to undergo emergency surgery. Sadly she never regained consciousness.

Investigators from Cootamundra Local Area Command are continuing with their inquiries into the circumstances surrounding the crash and are appealing to the community for witnesses to come forward.

Initially the crash was believed to only involve the Nissan however subsequent information has indicated the possibility that a second vehicle was involved.

Police are urging anyone with information about the crash, particularly if they have previously contacted police, or with new information to come forward.

Callers are urged to contact Cootamundra Police Station on 6942 0099 or Crime Stoppers on 1 800 333 000. Callers to Crime Stoppers can remain anonymous and a reward of up to $1000 is payable for information which leads to an arrest.