The accident occurred around 6:30 p.m. Wednesday on City Avenue near 54th Street.
Police said the SJU Junior was crossing City Avenue within a crosswalk from the Philadelphia side to the Lower Merion side when she was struck.
She was taken to Lankeneau Hospital in critical condition.
The driver did stop, but police said he faces DUI charges.
Police said marijuana was found in the car.
The investigation is ongoing.
***This story is developing. Check back with 6abc.com for updates.***
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