An Ohio teacher has pleaded guilty to sexually abusing one of her former students, beginning when the girl was just 13 years old.

Stefanie Erin Kellenberger, 40, admitted guilt on Friday to four counts of third-degree felony sexual battery and 17 counts of third-degree felony unlawful sexual conduct with a minor, the Mansfield News Journal reports.

The former Shelby Middle School English teacher now faces up to 15 years imprisonment at her sentencing on October 6 - just one day before her 41st birthday.

Prosecutors say she began grooming the victim when she was 13 years old, and the sexual contact started the following year, after the girl turned 14. It then continued 'until the age of consent,' which is 16 in the state, Bryan Dove, assistant prosecutor for Richland County claimed.

The crimes all occurred at Kellenberger's home in Shelby from February 2020 through October 2021.