Greg Jenkins, the executive director of Mr. Bush’s second inaugural, said, “I have never heard anybody getting that kind of fee associated with any inaugural, ever.”

Ms. Winston Wolkoff often fought with other top aides, according to people with direct knowledge of events. She was known to threaten to have senior officials fired, at times brandishing a cellphone and saying she would text Mrs. Trump or Ivanka Trump, the president’s elder daughter, conveying a sense of authority that people later came to realize she did not have, three people with direct knowledge of the events said.

A lawyer for Ms. Winston Wolkoff declined to comment.

A spokesman for WIS Media Partners said all of the firm’s charges “were vetted, authorized and signed off on” by the committee’s top officials, including Thomas J. Barrack Jr., the committee’s chairman; Rick Gates, the deputy chairman; and Sara Armstrong, the chief executive.

He said the firm’s fees were “significantly below” the customary charges “for equivalent productions,” and that officials provided the inaugural committee with “all its audited records and receipts.” He said the company could not reveal more because it is legally barred by the inaugural committee from discussing its work on the inaugural events.

In a statement, Mr. Barrack said he continues “to be proud of the incredible work of all those that were part of the committee” and that it “complied with all laws and regulations, and its finances were fully audited internally and independently. The donors were fully vetted and disclosed to the Federal Election Commission as required.”

Mr. Trump’s inaugural committee has come under scrutiny in the past for its high administrative and logistical costs. The new details help flesh out how the inaugural spent the money. Among the payments was more than $2 million spent on the firm of the Trump campaign official Brad Parscale for online advertisements to drum up inaugural crowds.

Another $2.7 million was spent on flying in a performance group working with Steve Wynn, the casino magnate and friend of Mr. Trump.