A circuit court judge on Tuesday ordered Kristina Karamo, the deposed leader of the Michigan Republicans, to abandon her efforts to cling to power. But what that means for Saturday, when Ms. Karamo had pledged to hold a dueling presidential nominating convention, remains unclear.

“I have to comply with the judge’s orders,” she told reporters after the court hearing, according to The Detroit Free Press.

She also called the ruling “egregious,” and said “I’m not going to jail.” But she did not say when asked if she would abandon her plans for the convention on Saturday in Detroit.

In a two-page order, Judge J. Joseph Rossi of the 17th Circuit Court in Grand Rapids, Mich., granted a preliminary injunction to the group of Republicans that voted in January to oust her. He barred Ms. Karamo from presenting herself as the party’s leader and conducting business in its name, including organizing meetings.

The judge determined that a group of state G.O.P. leaders, disillusioned over transparency issues and money problems in the party, had followed the party’s bylaws when they voted on Jan. 6 to remove Ms. Karamo as chairwoman and later elected Pete Hoekstra, whom the Republican National Committee recognized as the rightful chairman earlier this month.

Mr. Hoekstra, whom Ms. Karamo had denied access to the party’s bank and email accounts, said in an interview that he was “thrilled” by the ruling.

“When Michigan opens for business tomorrow, we will be going to the banks,” said Mr. Hoekstra. He had a warning for Ms. Karamo’s holdouts: “If there’s individuals that are not cooperative, as we’ve done so far, we will seek compliance through the courts.”

Ms. Karamo did not immediately respond to requests for comment on Tuesday.

The judge also forbade her from accessing the party’s bank accounts and postal boxes, and from engaging in communication on social media on behalf of the party. In recent days, she had used the party’s social media accounts to promote her “convention” in Detroit on Saturday.

The gathering had been scheduled for 10 a.m. Eastern time, the same time that the convention organized by Mr. Hoekstra is scheduled to take place across the state in Grand Rapids.

Both sides are loyal to former President Donald J. Trump, who weighed in on the leadership fight, backing Mr. Hoekstra, his former ambassador to the Netherlands and a former House member.

Mr. Hoekstra said that he was not ruling out a situation where Ms. Karamo goes ahead with her competing gathering on Saturday.

“They have shown themselves to be unpredictable,” he said.