A homecare assistant who crashed into the side of a car driven by an elderly nun failed to notice that the victim had a green light.
Qadro Ibrahim (27) left the nun with a number of physical injuries, and she needed extensive physiotherapy before she recovered.
Judge David McHugh fined the defendant €200 and also banned her from the road for two years.
Ibrahim, of Clonard Road, Dublin 12, admitted before Blanchardstown District Court to dangerous driving.
The incident took place on Naas Road in Clondalkin on December 10 last year.
A garda witness said the injured party was stopped at a set of traffic lights, and when the light turned green, she moved forward.
Ibrahim then collided with the side of the victim's car.
The court heard that the elderly nun was taken by ambulance to St James's Hospital after the accident.
She suffered a number of injuries in the collision and required extensive physiotherapy, but had since made a full recovery.
The court heard the defendant had never been in trouble before.
Defence solicitor John O'Doherty described the incident as an "accident" and said the defendant had expressed "genuine remorse" about what had happened.
Mr O'Doherty said Ibrahim was originally from Somalia and had lived in Ireland for three years.
The solicitor said that Ibrahim had one child and was working as a homecare assistant.
Mr O'Doherty said Ibrahim was fully insured, as was the injured party.
He asked the judge to consider reducing the charge from dangerous driving to careless driving, which does not carry a mandatory driving ban.
Mr O'Doherty said that Ibrahim worked as a homecare assistant and she needed her driving licence to be able to carry out her tasks in the course of work.
However, Judge McHugh said he was leaving the charge as one of dangerous driving.