Philadelphia — A U.S. judge on Monday sentenced an American woman who called herself Jihad Jane to 10 years in prison,  at least a decade less than prosecutors had sought for her role in a failed plot to kill a Swedish artist who had depicted the head of the Muslim Prophet Mohammad on a dog.

Colleen R. LaRose, 50, who converted to Islam online and has maintained her faith, was given credit for the four years she has already served. LaRose, who pleaded guilty to following orders in 2009 from alleged al Qaeda operatives, could have received a life sentence.

“It’s a just and reasonable sentence,” her attorney, Mark Wilson, told reporters after the hearing. “She’s pleased. Ten years is about what we were hoping for all along.”

U.S. District Judge Petrese Tucker called LaRose’s crimes “gravely serious,” adding, “The court has no doubt that, given the opportunity, Ms. LaRose would have completed the mission.”

Tucker also cited the significant cooperation LaRose has given the Federal Bureau of Investigation in other terrorism cases since her 2009 arrest, as well as the sexual and other abuse she suffered as a child. 

LaRose, who used the name Jihad Jane as she became involved in the Muslim online community, traveled to Europe in 2009 intending to participate in a militant plot to shoot artist Lars Vilks in the chest six times. But LaRose became impatient with the men who lured her to Europe and she gave up after six weeks and returned to Philadelphia, where she was arrested.

Assistant U.S. Attorney Jennifer Arbittier Williams had sought “decades behind bars” for LaRose, arguing that despite her extensive cooperation, she still was a danger to society. Prosecutors also had pointed out that LaRose – a blond, green-eyed, white American – did not fit the stereotype of an Islamic militant.

“This is a sentencing that people are watching,” Williams said on Monday. “Ms. LaRose had such a big impact in the public and press because she really did change the face of what the world thought of as a violent jihadist. It was scary for people to hear that Ms. LaRose could have been radicalized simply online in the U.S.”

Under U.S. sentencing rules, LaRose likely will serve 90 percent of her sentence, which means she will be eligible for release around 2020. LaRose was in solitary confinement for four years but recently moved to the general population at a Philadelphia jail.