Among Ms Nielsen's critics has been National Security Adviser John Bolton, who last month was widely reported to have erupted in a shouting match with Mr Kelly right outside the Oval Office over her performance.
Row: Donald Trump with wife Melania in Paris last weekend for the Armistice Day Centenary ceremony.
The other main takeaway from Trump's trip was a PR blunder when the White House cancelled his plan to visit an American military cemetery due to rain grounding the presidential helicopter. He thought it "made him look like a bossed-around husband", Jake Tapper reported.
According to the New York Times, Ricardel had accused some of Trump's most trusted aides of inappropriate behavior which the first lady said were false claims.
As the White House braces for even more high-level staff shakeups, press secretary Sarah Huckabee Sanders said Ms. Ricardel "will continue to support the president as she departs the White House to transition to a new role within the administration".
However, Sanders would not say which position she will be moving into.
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Then you have players like (Karen) Khachanov, of course, ( Stefanos) Tsitsipas , (Borna) Coric. I'll try my best to add as much clarity as possible with these, during tomorrow's preview.
Ms Ricardel could not be reached for comment.
A transoceanic staff crisis that engulfed the National Security Council this week is partly rooted in a bureaucratic dispute over the seating arrangements aboard Ms Trump's plane to Africa last month during her maiden solo trip overseas.
"I admire the President and First Lady and have great respect for my colleagues who are dedicated to supporting the President's policies", Ricardel said in a statement to The Associated Press.
Trump again called the investigation "highly conflicted".
Yet according to current and former officials, Ricardel had frequently clashed with Defense Secretary Jim Mattis, berated people in meetings, yelled at professional staff and argued with the first lady.
Mr Bolton hired Ms Ricardel in April from the Commerce Department. She previously worked in the Defense Department under President George W. Bush. Her office stated that Ricardel no longer deserved the honour of serving in this administration.
"I am deeply grateful for all Mira has done on behalf of the NSC, her deep knowledge of the national security issues we confront daily, and her unwavering commitment to the President", Bolton told staff.