The first lady, Melania Trump, has parted ways with an adviser after news about the adviser’s firm reaping $26 million in payments to help plan President Trump’s inauguration.

Stephanie Winston Wolkoff, who has been friends with Mrs. Trump for years, had been working on a contract basis as an unpaid senior adviser to the office of the first lady.

Stephanie Grisham, Mrs. Trump’s spokeswoman, said the office had “severed the gratuitous services contract with Ms. Wolkoff,” who Ms. Grisham said had been employed as “a special government employee” to work on specific projects. “We thank her for her hard work and wish her all the best.”

The contract was terminated last week, according to two people with direct knowledge of the situation.