PITTSBURGH — A western Pennsylvania woman who fatally shot an FBI agent during a pre-dawn drug raid at her home in 2008 again wants a federal judge to reduce her 15-year, 10-month prison sentence.

Christina Korbe’s attorneys are targeting a provision under the 1984 Armed Career Criminal Act, which affects thousands of defendants nationwide since the U.S. Supreme Court found it unconstitutionally vague last year.

The act allowed for enhanced prison sentences when a person uses guns in violent crimes. Korbe’s attorneys contend her sentence was driven by nearly identical language in one of two statutes to which she pleaded guilty — discharging a firearm during or in relation to a crime of violence — and is therefore illegal, too.

But Assistant U.S. Attorney Troy Rivetti argued in a response Thursday that Korbe can’t appeal because she agreed not to challenge her sentence under the January 2011 plea bargain she struck for the shooting of Special Agent Samuel Hicks.

“The government has complied with its promises under the plea agreement that it negotiated with defendant Korbe,” Rivetti wrote. “She has not.”

Prosecutors agreed to the 190-month sentence after dropping drug-trafficking conspiracy and weapons charges carrying a minimum 45-year prison sentence in return for Korbe’s plea to the firearms charge and voluntary manslaughter. That’s a lesser charge than murder of a federal officer, which was also dropped.

Korbe tried to get her sentenced reduced three years ago arguing she’s made “exceptional” rehabilitation efforts in prison. But prosecutors said those efforts — getting her GED diploma and completing drug abuse courses — were routine, although commendable, and her effort failed.

Hicks, a 33-year-old married father of a toddler, was shot by Korbe on Nov. 19, 2008, when he was the first officer in the door during the raid targeting her husband, Robert, who’s now serving 25 years in prison for cocaine trafficking.

Christina Korbe’s attorneys have portrayed the 47-year-old Indiana Township woman as a soccer mom largely unaware of her husband’s dealings.

But Rivetti noted that officers heard Robert Korbe yell, “Who the (expletive) is it?” through the door before running downstairs to flush some cocaine down a drain during the 6 a.m. raid. Authorities later found more than a pound of powder and crack cocaine, drug paraphernalia and several guns in the house.

Christina Korbe claimed she thought unknown intruders had burst into her home and she fired from the top of a stairwell because she was startled and concerned for her children.

Korbe tearfully apologized during sentencing, but also blamed the FBI’s tactics, saying “the element of surprise is not worth someone’s life.”

She was sentenced to five years, 10 months in prison for voluntary manslaughter, but had 10 years tacked on for the firearms charge because she used the weapon in a “crime of violence.” That’s defined as a felony that “by its nature, involves a substantial risk that physical force against the person or property of another may be used in the course of committing an offense.”

Korbe’s attorneys say she’s entitled to be re-sentenced because a similar definition of “crime of violence” in the 1984 act was struck down as vague and because voluntary manslaughter isn’t listed among the crimes that automatically trigger the 10-year firearms enhancement. Their legal arguments are due Sept. 26.