Thirty-three-year-old Jennie Lynn Britt of Sidney pleaded guilty to conspiracy to distribute methamphetamines during a Thursday appearance before U.S. District Judge Susan Watters.
Britt faces a mandatory minimum of 10 years in prison at her May 14 sentencing.
Authorities linked Britt to a trafficking ring that distributed drugs in Sidney, Fairview, Billings, Big Timber, Columbus, Livingston and Bozeman.
Under the terms of a plea deal, government attorneys would drop additional charges of possession of meth with intent to distribute and possession of a firearm during a drug trafficking crime.
Prosecutors also will recommend sentencing reductions because Britt accepted responsibility in the case.