Not much is known of her activities in 2017, though she did attend the National Prayer Breakfast that year with Torshin. They were slated to meet Trump at the breakfast but the meeting was canceled at the last minute when Trump was informed of Torshin’s ties to organized crime (via Vox).
Later that year, the Senate Intelligence Committee targeted the finances of Butina, Torshin, and Erickson for investigation. In December she declined a request to testify in front of the Senate Judiciary Committee (via BuzzFeed News).
In April 2018 Torshin was sanctioned by the Treasury Department. Later that month, Butina’s apartment was raided by armed FBI agents. By June she was offering to assist prosecutors investigating Erickson. Finally in July she was arrested and charged with acting as an unregistered foreign agent (via CNN).
Three days after her arrest she pleaded not guilty in a preliminary hearing, according to Reuters. But by December she had worked out a deal with prosecutors and pleaded guilty to the charges (via The Washington Post). In April of 2019 she was sentenced to 18 months in federal prison with time served. She was released in October, having served 15 months, and deported the next day (via BBC).