The prosecutor said she waged an eight-day reign of terror last October because she did not like her class assignment.
The Bucks County district attorney introduced pictures of sometimes obscene threats on school walls and scribbled notes on paper, threatening bomb and gun violence at Longstreth Elementary.
Police say Romanyszyn wanted to teach fifth grade instead of fourth grade.
The government alleges the 45-year-old teacher also planted a fake bomb inside a classroom to further scare the staff and students.
The prosecutor says it has surveillance video of Romanyszyn entering and leaving the room where the fake bomb was found and leaving with an empty bag. Her fingerprints were also found on one of the threatening notes, sloppily written to look like the work of a grade school student.
Romanyszyn is on leave. She has maintained her innocence from the start.
