The girl was riding in the back seat as her family headed to a Christmas celebration, said Trooper Keith Leary with the Washington State Patrol. She died at the scene.
The driver of the car was injured and was taken by helicopter to a Seattle hospital, Leary said.
Two children in the car suffered minor injuries.
The crash happened about 12:45 p.m. along Bailey Road, south of Clinton.
The branch fell due to high winds, Leary said.
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