Ms Yingluck called a meeting of all permanent secretaries and top officials of state agencies at the Royal Thai Air Force Academy to assess the impact of the political unrest on the country and discuss a new general election.
Narong Sahametapat, permanent secretary for public health, Kittipong Kittayarak, permanent secretary for justice, and National Security Council (NSC) secretary-general Thawil Pliensri did not attend.
Dr Narong and Mr Kittipong also did not send a representative to the meeting, but an NSC official attended on behalf of Mr Thawil.
The three officials are known for their support for reform. Dr Narong and Mr Thawil openly support the campaign of the People's Democratic Reform Committee.
Ms Yingluck posted on her Facebook page that officials were urged to speed up projects which can be undertaken during the absence of a permanent administration, to limit the damage.
She had hopes for a plan told hold a new general election and to move forward.
The prime minister was also to meet with the Election Commission on Wednesday at the academy to discuss a future of election.