California ? A Lexington, Neb., middle school teacher accused of running away to Mexico with a 13-year-old to have sex with him appeared in court Monday to face criminal charges.

Kelsey Peterson said nothing as charges that she crossed the border to have sex with a minor were read by U.S. Magistrate Judge Peter Lewis. The judge scheduled a hearing for Wednesday to ask whether Peterson would waive extradition to Nebraska.

Peterson, 25, was taken into custody Friday in Mexicali, Mexico, after the boy’s relatives told police he had called home asking for money. She was turned over to FBI agents early Saturday and is being held at the Imperial County jail in El Centro, about 120 miles east of San Diego.

The boy was turned over to relatives in Mexico. He was an illegal immigrant while residing in the United States and might not be able to return to the rural Nebraska town where he was an eighth-grader.