In her first interview since her daughter began serving a five-year prison sentence, the mother of whistle-blower Reality Winner said her daughter is being silenced.

Billie Winner-Davis, Reality’s mother, said her daughter is being blocked by US prison authorities from talking to the media.

“She has been warned, and she has been frightened as far as the restrictions on her communications,” Winner-Davis said. “She knows with her plea agreement, what she can and cannot discuss. But the bureau of prisons has made it even harder for her because they’re telling her she cannot even have any contact with any kind of journalists or media, in any way, shape, or form.”

In 2017, Winner, the first whistle-blower arrested during the Trump administration, leaked a classified NSA document describing a Russian cyber-attack on a United States voting software supplier.

Prosecutors claim the document Reality released contained top secret information that revealed national intelligence sources and methods.

The leak was the first confirmation of the extent of Russia’s interference in the 2016 presidential election.