A woman who lay trapped in a car for three days after it crashed on a Scottish motorway was conscious and trying to escape when rescuers arrived, her brother has said.

Lamara Bell, 25, lay injured for about 72 hours following the accident on the M9 in Stirlingshire on 5 July, and died in hospital four days after she was found.

Her partner, 28-year-old John Yuill, died in the crash, which was reported to police but not followed up.

In a post on Facebook, Bell’s brother Martin said police investigations have revealed his sister was conscious and able to speak to rescuers when they found her.

He said: “She was defo 100% conscious … She was able to tell them her name. She added four years on to her age and told them she was 29. She did also say she was only in the car for 20 mins.

He added: “They also said she was still moving around trying to get out the car but was trapped.

“Proud of my sis for doing so well over those three days then the following days in hospital for not giving up the fight. Brave amazing girl. She gave it her all and fought until the end.”

Bell, who had two children and was known as Mara to friends, was found alive in the couple’s blue Renault Clio on 8 July but died a week later in hospital.

The car, which left a slip road and went down an embankment, was reported on the day of the accident but the details were not entered into the police system.

It was eventually located by officers on 8 July following up another call from a member of the public who had seen the vehicle.

The Scottish justice secretary, Michael Matheson, has ordered a review of all police call handling and the case is the subject of an independent investigation by the police investigations and review commissioner.