Zahram Bahrami's execution appears to have been punishment for a conviction on other charges. State television says she was hanged Saturday for possessing and selling drugs.
The report said that initially she was arrested for committing "security crimes," but it did not say what became of that case.
The protesters who took to the streets after President Mahmoud Ahmadinejad's re-election said the voting was marred by fraud and that opposition leader Mir Hossein Mousavi was the rightful winner.