The final decision about the project is expected to come from the West Wing.
The rest of Redford’s agenda for her latest visit was not clear Thursday afternoon.
But officials from Alberta and the Canadian federal government are making a strong diplomatic push for Obama administration approval of the pipeline.
E2-Wire spoke with Redford when she was in Washington, D.C., in February.
Pipeline backers will press their case in other forums next week as well.
A House Energy and Commerce Committee sub-panel will hold a Wednesday hearing on legislation, which House GOP leadership has deemed a priority, that would authorize construction of Keystone.