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EDWARDSVILLE, Ill. -- A southwestern Illinois woman accused of sexually attacking a girl over a one-year span has been ordered to spend 20 years in prison.

Twenty-three-year-old Danielle Armstrong of Alton was sentenced Tuesday in Madison County. She, along with her husband David Armstrong, pleaded guilty in May to one count of predatory criminal sexual assault of a child.

The couple has been jailed since they were charged in July 2012 with molesting the girl, who was then 5 years old. Authorities say the abuse took place between July 2011 and July of last year.

Sentencing for 34-year-old David Armstrong is set for next Tuesday.

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