Ashley Fisler, 36, of Washington Township, was arrested last week on eight charges, including sexual assault of a minor, endangering the welfare of a child and official misconduct by a public servant.
According to court documents, the victim - who is now an adult - told police in January there were multiple sexual encounters in 2021, including incidents inside Fisler's vehicle and her classroom at Orchard Valley Middle School.
During a hearing this week, prosecutors revealed investigators recovered approximately 7,500 pages of text messages between the victim and Fisler.
A criminal complaint alleges that Fisler also sent multiple nude photographs to the victim.
Officials say Fisler is no longer employed as a teacher in Washington Township or elsewhere.
Fisler has denied the allegations against her.
She is scheduled to return to court on May 14.