Rebecca D. Thompson turned herself in to authorities at the Bladen County Sheriff's Office on Thursday evening.
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Thompson has been charged with conspiracy to commit felonious obstruction of justice and possession of absentee ballot.
Tonia Marie Gordon and Matthew Monroe Mathis were arrested last week in connection with the investigation.
Caitlyn Croom was also arrested and charged with conspiracy to commit felony obstruction of justice and possession of absentee ballot.
Leslie McCrae Dowless, the political operative at the center of the investigation, was arrested on Feb. 27 on criminal charges about activities in the 2016 elections and the Republican primary in 2018.
Dowless faces charges of three counts felonious obstruction of justice, two counts of conspiracy to commit obstruction of justice and two counts of possession of absentee ballots.
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According to testimony and other findings detailed at an election board hearing last week, Dowless conducted an illegal "ballot harvesting" operation. He and his assistants are accused of gathering up absentee ballots from voters by offering to put them in the mail.
He was working on behalf of Republican candidate Mark Harris, who had a slim lead in the vote count before the investigation.
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