PARIS  Dominique Broueilh is an unlikely cyberdelinquent, much less a political dissident. But earlier this year, Ms. Broueilh, 50, a homemaker and mother of three, found herself the target of a police investigation and a lawsuit from a French cabinet official because of a comment she had posted online.

Ms. Broueilh had come upon a video of the official, Nadine Morano, the secretary of state for the family, caught in a seeming untruth regarding her presence at a 2007 conference. “Oh, the liar,” Ms. Broueilh wrote, under a pseudonym, in comments below the clip.

The judicial police called in May on a weekday afternoon.

“I said to myself, ‘This must be a joke, it’s not possible,’ ” Ms. Broueilh recounted in a telephone interview from her home in St.-Paul-lès-Dax, south of Bordeaux. “It’s ridiculous, after all.”

The police said Ms. Morano, a combative politician and one of President Nicolas Sarkozy’s closest allies, had subpoenaed Ms. Broueilh’s Internet protocol address, obtained her identity and brought suit against her for “public insult toward a member of the ministry,” an offense punishable by a fine of up to $18,000.