A second teenage girl has pleaded guilty and been sentenced to prison in the videotaped beating of a mentally disabled woman who was sitting on her steps in a struggling city just outside Philadelphia.

The Delaware County Daily Times reports ( http://bit.ly/12etInz) the 17-year-old girl was sentenced Thursday to 6 to 23 months in prison. She pleaded guilty to charges of conspiracy to commit aggravated assault and conspiracy to recklessly endanger another person.

Investigators allege the six female defendants - apparently for fun - punched, kicked and hit the 48-year-old woman with a shoe and a chair in Chester in September. One recorded the beating, which was posted online.

A 16-year-old girl was sentenced in the case Tuesday. Cases against the other defendants are still pending.

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Information from: Delaware County Daily Times, http://www.delcotimes.com