Sabrina Milo, 34, was arraigned in Brooklyn Criminal Court Saturday, a day after she was allegedly overheard by two teachers making the threat in a break room at Fort Hamilton High School, prosecutors said.
Milo's attorney, Andrew Stoll had argued that she should be released without bail, insisting that she posed no threat to anyone, doesn't have weapons and that she needs medication.
"The grand jury will decide," Stoll told the Daily News. "I'm convinced it will be dismissed."
Milo allegedly said she would "settle some scores" by bringing a machine gun into the school, under her trench coat, and that it would be Columbine all over again. In the 1999 Columbine tragedy, two students dressed in trench coats killed 13 classmates in their suburban Denver high school.
"This woman talked about pulling a Columbine and we take these threats very seriously," a police source told the News.
The teachers who overhead the threat called the school safety officer, who pulled Milo out of class and arrested her. Prosecutors said she was crying at a table when she made the threat.
Police were seeking a search warrant for her Staten Island home and computer, officials said.
Milo, according to a source, has had disciplinary problems at the Bay Ridge school. The News reports that she was yanked from the school in May amid allegations she hit a student. One teacher said she had "hit a kid with a ruler on her fingertips."
Other students told the newspaper that they believed the situation has been blown out of proportion and that Milo was not a threat to students. They said the teacher was quirky and well-liked. She is married to another teacher at the school, sources said.
According to her Linkedin profile, Milo taught fine arts at the school.
She faces up to seven years behind bars if convicted.