The Winnebago county sheriff's office says it happened on County Highway II in the Town of Clayton, west of Neenah.
Deputies say the three women were riding in an SUV with two other people when they were hit by a car that didn't stop at a stop sign. Deputies say that car was driven by a 66-year-old man.
Four of the SUV's passengers were taken to the hospital, the girl was pronounced dead at the scene. The driver of the car suffered minor injuries.
The sheriff's office says the crash is still under investigation.
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