The federal investigation into D.C. Mayor Vincent Gray’s campaign is unlikely to conclude before next summer after a federal judge postponed a hearing for a woman who helped implement the illegal, off-the-books shadow campaign that boosted Gray’s prospects.

Jeanne Clarke Harris, who served as a communications consultant to Gray’s 2010 campaign, was scheduled to appear in U.S. District Court for a status hearing Monday, but Judge Colleen Kollar-Kotelly agreed to delay it until March because prosecutors said they weren’t ready to set a sentencing date. The postponement means it’s unlikely Harris will face sentencing before June.