Rep. Haley Stevens’ Washington office was locked Monday as the House returned for its first day in session since September, raising questions about whether the Michigan Democrat will return for the remainder of the Congress.

The apparent absence followed a mass departure of staffers last week after Stevens made a last-minute endorsement of Republican Senate candidate Mike Rogers. Rogers was running against Abdul El-Sayed, the Democrat who defeated Stevens in a contentious August primary. El-Sayed went on to beat Rogers by 7 points.

On Monday afternoon, the doors to Stevens’ office in the Rayburn House Office Building were locked, despite a sign hanging outside that read “please come in.” No one answered repeated knocks from a reporter or from a staffer from another congressional office who also tried to enter.

A look through the mail slot suggested the lights inside were off. Multiple calls to Stevens’ Capitol Hill office went directly to voicemail without ringing. A recorded message directed constituents to contact her district office in Farmington Hills, Michigan.

A call to the district office rang but went unanswered. POLITICO left a voicemail asking whether Stevens planned to return to Capitol Hill for votes. Email requests for comment sent to her campaign and congressional office were not immediately returned.

The House’s first votes of the day were not scheduled until 6:30 p.m. Monday. Still, staffers for other members were working in offices around Capitol Hill, as is customary when the House is in session.

Stevens’ endorsement of Rogers came after her defeat to El-Sayed in the Democratic Senate primary. The staff departures that followed left her congressional operation facing uncertainty as lawmakers returned to Washington.

Whether Stevens would be present for the evening’s votes, or return for the remainder of the Congress, remained unanswered Monday afternoon.