A woman who was "day-dreaming" when she drove into and killed a cyclist a week before the victim was due to get married has been spared jail by a District Court judge.

Alessandra Anne Campanella, 34, pleaded guilty to an aggravated charge of driving without due care.

The court heard she veered into cyclist Erana Scharfbillig on Trimmer Parade at Grange in March 2014.

It heard Ms Scharfbillig was due to get married the following week and was a much loved member of her family and highly respected by her work colleagues.

Ms Scharfbillig was "virtually stationary" on her bicycle when she was struck from behind by Campanella's car, the court was told.

Judge Paul Cuthbertson said Campanella was not speeding or intoxicated, but had a "gross lapse of concentration" and was likely day-dreaming when she drifted into the victim.

Judge Cuthbertson said most drivers would be guilty of momentary lapses of concentration, but occasionally such lapses resulted in devastating consequences.

"She was doing nothing legally wrong except for not paying proper attention, something we all do when driving to a greater or lesser degree," Judge Cuthbertson said.

He said he accepted Campanella was genuinely remorseful and was a "good person".

"I think she will carry this cross for the rest of her life," Judge Cuthbertson said.

He suspended an 11-week jail sentence and placed Campanella on a three-year bond.

Campanella was ordered to perform 200 hours of community service and was disqualified from driving for six years.