The youngster was a passenger in a black Ford Fiesta which collided with two cars on the A258 in Swingate, near Dover, at 1415 BST on Saturday.
She was pronounced dead at the scene of the accident by paramedics.
Two other children and a woman, who were also travelling in the Ford Fiesta, suffered multiple injuries.
Crash investigation
Firefighters used cutting equipment to free the female driver, who was taken to the Queen Elizabeth Queen Mother Hospital (QEQM) in Margate for treatment along with the youngsters.
The occupants of the two other vehicles involved in the collision were uninjured.
Kent Police closed the road while their serious crash investigation unit examined the area.
They have asked any witnesses to the accident to contact them.
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