During a Kansas Youth in Government field trip to the state Capitol on November 21, Sullivan wrote: "Just made mean comments at gov brownback and told him he sucked, in person #heblowsalot."
The Shawnee Mission East senior said she did not actually talk to Brownback, and the post referenced a joke she had with a student on the trip.
The next day, she was called into the principal's office.
"I had no idea what it was about or why I was being called into the office," she said. "I had never been in trouble before."
A Brownback staffer had notified the principal, she said.
"My principal told me he needed to do damage control and was really upset," Sullivan said. "He said I was an embarrassment to the school and the school district and that I had been disrespectful."
The principal then asked her to write a letter of apology to Brownback and his staff. He set Monday as the due date for the letter.
Sullivan said she did not know what will happen when she does not turn in the letter Monday. But she hopes the tweet will bring attention to the issue of free speech.