State police said school officials contacted them on Nov. 27 after obtaining a cellphone with sexually explicit text conversations between the victim and Ondish. She is also accused of buying the victim that cellphone, which is against school rules.
Ondish began working at the school, a rehabilitation facility for juvenile offenders, in June.
Summit Academy released this statement Monday afternoon.
"The administration at Summit Academy was made aware of an inappropriate relationship between a teacher and a student and it was immediately reported to the state police. The teacher was then terminated."
Troopers said Ondish told them she was in an abusive relationship at home and developed an emotional attachment to the student.