She was forced out of the Renault Megane by a man who jumped out of another vehicle which pulled up behind.
The woman, who was in a parked car, was uninjured but has been left badly shaken by the ordeal.
The incident happened in the Derriaghy Road area of Lisburn at about 7pm last night.
A spokeswoman for the Police Service of Northern Ireland (PSNI) appealed for any witnesses to come forward.
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