Izzana Hamyd was arrested and detained for 72 hours following the Charlie Hebdo attack, before being released.
Hamyd has "expressed her indignation and condemnation of violence" to officers investigating her over her husband's involvement in the attack.
Her lawyer, Christian Saint-Palais, said his client has "the same reaction as that of the entire nation," and is "stupefied" by the attack.
Speaking at the Unity March in Paris on Sunday (11 January) that was attended by an estimated 3.7 million people, Saint-Palais said his client was not aware of her husband and his brother's planned terrorist attacks.
Sharing Izzana Hamyd's sentiment, the mother and sisters of the jihadist gunman, Amedy Coulibaly, who held several people hostage at a kosher supermarket in eastern Paris on 9 January, also released a statement.
The statement read: "We absolutely do not share these extreme ideas. We hope there will not be any confusion between these odious acts and the Muslim religion."