A Destrehan High School teacher who is the daughter of the St. Charles Parish School Board president was arrested Thursday on an allegation that she carried on a sexual relationship with a high school student for nearly a year, starting when the girl was 16.

St. Charles Parish Sheriff Greg Champagne said investigators believe the relationship began in September 2014 and continued until August . A family member first reported the allegations to the Sheriff’s Office on Wednesday.

The teacher, 26-year-old Kimberly Naquin, was booked Thursday night on counts of carnal knowledge of a juvenile and prohibited sexual conduct between a student and an educator.

The sheriff said all parties in the case have cooperated in the investigation, although he stopped short of saying Naquin has confessed. Detectives believe no other students were involved.

Naquin is the daughter of Dennis Naquin, the School Board president.

Her arrest is just the latest in a series of accusations of sex between teachers and students that have buffeted Destrehan High.

Some of the encounters between Kimberly Naquin and the girl occurred inside a classroom at the school, authorities said, but most happened at the apartment complex where Kimberly Naquin then lived, the Lakes of Chateau North, on Loyola Drive in Kenner. She has since moved to Destrehan.

Champagne said detectives learned Thursday that Kimberly Naquin was at a Beta Club conference with students and other teachers in Lafayette. They traveled to that city and persuaded her to return voluntarily to St. Charles Parish, where she was arrested, he said.

Kimberly Naquin’s status as a teacher is unclear. Neither Dennis Naquin, School Board Vice President Melinda Bernard nor school district administrators returned requests for comment on Friday.

A former Destrehan High School teacher accused of carnal knowledge of a juvenile, 33-year-old Shelley Dufresne, agreed to a plea deal in St. Charles Parish last year, but she still faces two similar counts in Jefferson Parish. Like Kimberly Naquin, Dufresne has a high-placed family connection; her father is 29th Judicial District Judge Emile St. Pierre.

Another former Destrehan High teacher, Rachel Respess, was accused of taking part in a three-way sexual encounter with Dufresne and a 17-year-old male student in Kenner. Respess has been charged with failing to report that incident to authorities in Jefferson Parish but not with a sex crime.

Champagne declined to comment on why he thought the high school has repeatedly been at the center of sex allegations, calling that “a question for Dr. Phil.” But he said investigators believe there were no connections between this incident and the previous incidents.

“There’s not probably a whole lot that shocks us at this point in time,” Champagne said. “We’re just frustrated. Bewildered.”

Investigators are still looking into whether any other teachers or any administrators at the school were aware of the alleged relationship between Kimberly Naquin and the student, Champagne said.

He said Dennis Naquin sounded “distressed” when detectives informed him of the allegations and offered his cooperation.

Kimberly Naquin posted a $75,000 bond in St. Charles Parish and was then booked on the 10 counts of felony carnal knowledge she faces in Jefferson Parish, Kenner police Lt. Brian McGregor said.

Champagne said that if she is released in St. Charles Parish, she will be placed on home arrest and ordered not to have any contact with the student.