Police are investigating a Snapchat video that allegedly shows a young female driver moments before she was killed in a horrorible head-on crash west of Sydney on Sunday.

Shania McNeill, 21, from Queensland, was killed when the Suzuki Baleno she was driving was involved in a head-on collision with a Nissan Micra at Berkshire Park.

Police are now investigating a Snapchat video that allegedly shows Ms McNeill in the driver’s seat, posing for the camera while the engine revs loudly and a passenger screams, “Shania!”.

Ms McNeill then momentarily changes expression from looking happy to looking scared and shocked before the camera pans to the ground and the video cuts out.

Oncoming headlights can be seen at the beginning of the video.

The video was posted to Snapchat by Ms McNeill’s friend Faeda Hunter who was a passenger in the Suzuki that crashed on Sunday, killing Ms McNeil and injuring five others.