Tahya Gardner, 26, was sentenced to 20 months' jail in the ACT Supreme Court on Monday on two counts of being an accessory after the fact to an aggravated robbery.

But Chief Justice Helen Murrell suspended the sentence upon Gardner signing a good-behaviour order.

Gardner had pleaded not guilty to four charges of aiding and abetting the robberies. But she switched her plea to guilty when offered the less serious accessory-after-the-fact charge.

The court heard Gardner had been in a relationship with the alleged robber – who is still before the courts – at the time of the crimes.

On one occasion, she drove the man from the scene of a bottle-shop robbery in August 2012. The second count related to a knife-point robbery at a supermarket in May last year.

The court heard the relationship between the pair had been marked by substantial domestic violence, including once in 2011 when the man beat her while she had been heavily pregnant.

The man also used mental abuse to control her behaviour and isolate her from her family at the time of the robberies, the court heard.

The pair split in the middle of last year.

In sentencing, Chief Justice Murrell noted Gardner still suffered symptoms of anxiety and obsessive–compulsive disorder.

But the judge said the offender's strong family support and relative youth meant she could overcome her troubled background with support.