The victim was pushed by another woman as she stood on the platform at the Lexington Avenue/59th Street station around 5:40 p.m.
She bounced off the first car of the train as it entered the station and fell back onto the platform.
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She was treated for an injured arm at Lenox Hill Hospital. She is in stable condition.
The suspect, 33-year-old Linda Chavez, of Queens, was taken into custody.
She was charged with attempted murder and assault.
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