Hillary Clinton's longtime aide may be guarded when it comes to the exact details of her official duties, but one thing is certain: Huma Abedin is an extremely effective political strategist, according to a lengthy profile published this week by Vogue.

Abedin became an irreplaceable member of the Clintons' inner circle shortly after she first started working for them in the mid-1990s.

And it's not just her willingness to work grueling hours or her meticulous attention to detail that makes her so valuable to the Democratic candidate, the article explained.

Those qualities help, sure. But it is Abedin's eye for good political optics and her strategic mind that really make her really indispensable, the article added.

"[K]ey Clinton moments carry Abedin's fingerprints. The much-lauded move to kick off Clinton's candidacy on Roosevelt Island? Abedin's idea," Vogue reported.

Abedin said of the campaign launch, "I remember driving by the island, months before, thinking, God, if she runs, wouldn't it be amazing to do her announcement speech here?"

There are other big moments in Clinton's second campaign for the White House that saw Abedin playing a key role.

"Hillary Clinton's win over Bernie Sanders in the New York primary? A shift in ground-game strategy spearheaded by Abedin," Vanity Fair reported.

"A Clinton ad featuring Shonda Rhimes, along with Kerry Washington, Viola Davis, and Ellen Pompeo? Abedin's plan," it added.

Clinton campaign chairman John Podesta said of Abedin's strategy to defeat Sanders in the Empire State, "She knew how to adjust to a frame of campaigning that was literally kind of street-based in New York. It's really different from running around Iowa."

And Rhimes said of Abedin's role in the ad, "She's kind of a force of nature when she needs to be."

Abedin has been so valuable to the former first family, in fact, that she "never had a job that does not orbit Clinton or the people in her life," according to the article.

There are also the personal contributions that she has provided to Clinton, including a moment during Clinton's tenure at the State Department where it fell to Abedin, who speaks Arabic, to navigate a "delicate encounter" with the governor of Iraq.

As to the question of who will be Clinton's chief of staff should the Democratic candidate win the White House this November, Abedin isn't talking.

"People on rope lines will say, 'What job do you want in the White House?' And my face is totally blank. I can't even think to that point," she said.