She is a married mother of four who has been a teacher at North Penn since 2001.
Authorities say she pursued two of her students via the social networking website Facebook.
Montgomery County District Attorney Risa Vetri Ferman added the math teacher engaged in a sexual relationship with a 17-year-old male student just days ago.
The relationship allegedly began in April 2009. The District Attorney's Office claims that's when Zeo began having sexual conversations and contact with the student both on and off school grounds.
Investigators say Zeo confirmed to police that her relationship with the student began in classroom E-139 and later moved to a shopping center parking lot where they had sex in her green minivan.
Detectives were at the Zeo home on Thursday afternoon to serve a search warrant. They removed at least two computers.
Police say they are looking to see if Zeo had inappropriate contact with any other student.
Zeo's former students say she told them she had recorded an album of Christian songs as a profession of her faith.
"A couple of students wanted to hear it so she put it on during free time and said it was Christian," said student Kelley Horn, talking about Zeo's recording.
"She was always there to help the students. If you needed extra help she would give it to you," said student Tim Yoon. "Overall she was a really nice teacher to have."
When confronted, the D.A. says Zeo admitted to having a sexual relationship with only one of the students.
Zeo is currently on suspension from her teaching position at North Penn High School.
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