Coral Campbell was sentenced to two years jail after pleading guilty in the ACT Supreme Court to being an accessory to the aggravated robbery and riding in a stolen motor vehicle.

Chief Justice Terence Higgins released Campbell on a suspended sentence as she had already spent more than a year behind bars for the heist.

The court heard the 22-year-old's boyfriend held up the Commonwealth Bank at the Jamison Centre in April, 2011.

The man pointed a revolver at two tellers and demanded they fill a green shopping bag with cash, leaving the scene in a stolen car with $9160.

The man dumped the car in Cook before transferring to another car.

The court heard Campbell and two men were seen in the second car with stolen plates just after the robbery.

Police located the original getaway vehicle soon after and forensic tests recovered the man's thumbprint from the interior.

The court heard the pair used cash from the robbery to buy a secondhand car from a Fyshwick dealer later the same day.

Officers swooped on two properties the following morning, arresting the man and seizing the car and clothing suspected to be linked to the robbery.

In the weeks after, police recorded conversations between Campbell and her boyfriend when she visited him in jail, where the pair discussed the gunpoint theft.

Chief Justice Higgins sentenced Campbell to two years jail, backdated to take into account time spent in custody, to be suspended.

He also ordered Campbell enter a three-year good-behaviour order.

The man is due to appear in court next week for sentence.