Kelly Rindfleisch had appealed her conviction for misconduct in office, but the Supreme Court on Monday declined to take it. That ends the legal fight for Rindfleisch.
She was seeking a review of a 2-1 state appeals court ruling last year upholding her conviction.
Rindfleisch was one of six people convicted as a result of a now-concluded John Doe investigation focusing on activities in Walker's county executive office. Walker was never charged.
Rindfleisch pleaded guilty to one felony count of misconduct in office for doing campaign work while at her government job.
Justice David Prosser did not participate in issuing the order.