A woman who sued her former employer after it accused her of incompetence in filings with the Securities and Exchange Commission does not have a case for defamation or invasion of privacy, a federal judge held today.In a written opinion, U.S. District Judge John Z. Lee conceded statements falsely imputing that someone lacks the ability or integrity to perform his or her duties constitute defamation per se under Illinois law.But someone who is the subject of such a statement cannot prevail on a defamation claim if the …