A 56-year-old woman pleaded guilty Monday to federal charges of embezzling more than $120,000 over a three-year span from her employer, the American Conservative Union.

Federal prosecutors said that Diana Carr admitted to diverting the funds from the conservative advocacy group to her bank account from 2006 through June 2009.

According to court papers, she may have stolen as much as $400,000 from the ACU, headquartered in Alexandria, to pay off credit card bills and to make personal purchases.

Carr faces a maximum of 20 years in prison when she is sentenced on Sept. 16 before U.S. District Judge Claude M. Hilton.