Crews were dispatched around 8:15 p.m. to the first block of North Main Street (state Route 503), where a vehicle had struck a pedestrian.
The preliminary investigation found that Cooper was crossing North Main Street in the middle of the block when she was struck by a vehicle headed north in the northbound lane, according to the statement from Simpson.
The driver, a 17-year-old Lewisburg resident, and a juvenile passenger, were not injured.
Cooper was taken to Kettering Health Preble ER in Eaton, where she died from her injuries, the sheriff said.
The crash remains under investigation.
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