A woman who engaged in a standoff with Fairfax County police for more than 30 hours after kidnapping her ex-girlfriend was sentenced Friday to 16 months in prison. The victim was reported as a missing person last March. She later told police Brittany Copelin broke into her townhouse, fired a gunshot and kidnapped her. After the victim escaped in Fairfax County, Virginia, Copelin stayed inside her SUV on Route 1 for more than a day before police …