Summer vacation is over for Hillary Rodham Clinton. The former secretary of state spent most of the past few weeks plugging her latest book and going light on politically-inclined appearances. But post-Labor Day, Clinton is back at work with a jam-packed schedule -- an itinerary heavy on potentially campaign-aiding stops, including policy talks, foreign trips, outreach to key Democratic constituencies, and visits to key early-voting states.

Here's what she's up to:

Thinking globally. On Wednesday, Clinton made her first visit to the State Department since leaving in 2013, gathering with five former and present secretaries of state to break ground at the new United States Diplomacy Center. "We all know that we will never do anything more challenging in our lives than to serve these objectives," said Henry Kissinger. "I would say all of us, except one."

On Thursday, Clinton herself weighed in on Kissinger, reviewing his new book "World Order" for The Washington Post’s Book World. She got in a nod to her own book "Hard Choices" in her laudatory assessment of his take on the situation in the Middle East and Asia.

That wasn't her last internationally-minded trip of the week. On Friday, Clinton was headed to Mexico to speak at an event for Carlos Slim’s Helu Foundation. Notably, fellow 2016 candidate Chris Christie also went to Mexico this week to build up his international cred.

Paying her respects locally. On Sept. 16, Clinton is slated to headline a fundraiser for an organization that works to aid 9/11 victims, families, and first responders -- no doubt a reminder to some of her record, as a New York senator, of backing programs to aid those groups.

Spotlighting policy. On Thursday, Clinton sat down with progressive favorite John Podesta at a clean-energy conference in Las Vegas. Later this month, she'll be a heavy presence at the Clinton Global Initiative's 10th anniversary summit, where world leaders and policy heavyweights are expected to take the stage.

Building base cred. On Tuesday 9th, Clinton is hosting a fundraiser for the Democratic Women’s Senate Network at her home in Washington, with tickets starting at $10,000. A little more than a week later, she'll again make a plug for the political fortunes of Democratic women, speaking at the DNC's Women’s Leadership Forum in Washington, DC.

Putting in face time in major primary states. On Sept. 14, both Bill and Hillary Clinton are slated to attend Sen. Tom Harkin's (D-Iowa) final annual steak fry in Iowa — marking her first visit to that vital early-voting state since her loss there in the 2008 caucuses.