Pittsburgh police responded to the scene around 10 p.m. Wednesday.
The teen remained hospitalized Thursday in serious condition. Her name has not been released.
The teen's 23-year-old sister was arrested at the scene following an alleged altercation with police. She faces four counts of aggravated assault against police, as well as single counts of drunken driving and reckless endangerment.
No other injuries were reported.
Further details about the accident were not immediately available.
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