ATLANTA — A former police officer fired for flying the Confederate flag at her suburban Atlanta home has filed a federal lawsuit saying her termination violates her constitutional right to free speech.Silvia Cotriss had worked for the Roswell Police Department for about 20 years and was a sergeant when she was fired in July. The lawsuit was filed Wednesday against the city of Roswell, the police chief and the city administrator.The city attorney's office declined to comment Friday."This sort of high handed politically correct firing by the City of Roswell sets a horrible precedent and endangers the employment and constitutional rights of government employers across the State of Georgia," David Ates, an attorney for Cotriss, said in an emailed statement.Someone sent an email to the police chief on July 11 complaining that there was a Confederate flag flying in front of a home in neighboring Woodstock and that he believed a Roswell police officer lived there because he'd seen a Roswell police vehicle parked in the driveway, the lawsuit says. The man told the chief he felt that due to current race, police and human relations issues, an officer shouldn't be allowed to display that flag.Cotriss acknowledges flying a Confederate flag below an American flag on a flagpole in the front yard of the home she owns.Previously she had flown a flag that had a motorcycle in the center and a smaller version of the Confederate flag since April 2015.