The widow of Pulse gunman Omar Mateen pleaded not guilty in federal court Wednesday to charges she helped her husband and hindered the investigation into the massacre.

Noor Salman is charged with aiding and abetting Mateen's support of the Islamic State group. She faces up to life in prison if convicted.

"On June 12, 2016, Salman obstructed justice by engaging in misleading conduct towards officers of the Fort Pierce Police Department and special agents of the Federal Bureau of Investigation in order to prevent them from communicating to agents, the U.S. Department of Justice, and judges of the United States of America information relating to the attack at the Pulse Night Club in Orlando," the U.S. Attorney's Office, Middle District of Florida said in a statement.

Salman's plea comes two days after she was arrested at her Oakland, California home. She and Mateen had been living in Fort Pierce before the attack.

Prosecutors say Salman knew about Mateen's plans to attack Orlando's Pulse nightclub, where 49 people were killed and more than 50 others were hurt June 12, 2016 in the deadliest mass shooting in modern U.S. history.

Salman is expected back in court Feb. 1 for a detention hearing.

Information from the Associated Press is used in this report.