HACKENSACK -- A grand jury on Tuesday indicted a Lyndhurst woman accused of having sex with a 15-year-old girl.

Lauren Mitchell (Bergen County Prosecutor's Office)

The 16-count indictment charges Lauren Mitchell, 33, with endangering the welfare of a child, aggravated criminal sexual contact, sexual assault, contempt of a judicial order and official misconduct.

Mitchell had sex with a girl, identified only as J.J., between Oct. 1, 2014 and June 15, 2015, the indictment said. The girl turned 15 during that time.

The indictment said Mitchell had sexual conversations and exchanged texts and emails with the girl. Mitchell was a second-grade teacher at Dr. Lena Edwards Academic Charter School in Jersey City. The girl was a student there, but not one of Mitchell's.

Police arrested Mitchell in June after staff members at the school reported her. She posted $150,000 bail on the condition that she refrain from any contact with the girl.

Mitchell violated the order, the indictment said. The girl received calls and a text message from Mitchell, police said.

Myles Ma may be reached at mma@njadvancemedia.com. Follow him on Twitter @MylesMaNJ. Find NJ.com on Facebook.