Ms. Winston Wolkoff said she could not discuss the inaugural spending, saying that she had signed a nondisclosure agreement with the committee that had no expiration date. If the committee “were to release me from this obligation, I would be able to speak freely without the fear of legal or financial repercussions,” she said. “Otherwise, I am regrettably unable to provide any substantive comment.”

But documents reviewed by The Times showed that she had personally received about $500,000, a figure first reported by Vanity Fair. The documents show that a further $425,000 went to three producers, two of whom are associated with Mark Burnett, the creator of the reality-television show “The Apprentice,” which brought Mr. Trump fame over 14 seasons. And $2 million of the WIS money was used to cover costs related to the events-planning firm Hargrove, the committee’s second-largest vendor, the documents show.

The bulk of the $26 million to WIS, which handled a range of production issues including the broadcasting rights, was spent on an entity created by two of the three producers, called Inaugural Productions, the documents show. Other top vendors were David Monn, a New York-based events planner, who received nearly $4 million. He worked with Ms. Winston Wolkoff on the first Governor’s Ball at the White House, according to a person close to her.

Another top vendor, PRG, was paid $2.7 million, a cost that merely covered the staging for a group of performers who worked with the casino magnate Steve Wynn, according to people briefed on the spending.

After the initial round of articles in The Times and elsewhere about Ms. Winston Wolkoff and the money received by WIS, senior administration officials privately said she had been ousted from her job, primarily because the president and the first lady were angry over the spending and because officials at both the White House and the inaugural committee had found her difficult to work with.

Yet in private communications with Ms. Winston Wolkoff on Feb. 20, 2018, a deputy White House counsel, Stefan Passantino, told her that the administration was terminating all types of “gratuitous service agreements,” the type of employment agreement she had with the White House, around the same time amid a controversy over security clearances involving other officials.

She was assured by Mr. Passantino that “you didn’t do anything wrong, and there’s nothing wrong with this kind of contract, and I don’t want you to think that this has anything to do with” the inaugural spending, she recalled. “So this is not personal.”