U.S. District Court Judge Dale Kimball gave Wanda Barzee seven years credit for time served and ordered her to spend the rest of the term at a medical and psychiatric center for female federal prisoners in Texas, CNN reported.
Barzee had pleaded guilty to helping her then-husband Brian David Mitchell kidnap Smart, then 14, from her Salt Lake City home in 2002.
"I know the gravity of my crimes and how serious they are," said Barzee, 64. "I'm just so sorry again for all the pain and suffering I caused upon the Smart family."
Smart's mother, Lois, told Barzee: "What you did to Elizabeth and our family was wrong and evil. You hurt our family in ways you'll never know…. I hope you will be able to make peace with your maker."
As part of a deal, Barzee agreed to testify against Mitchell, whose trial is to begin in November.
Mitchell, 56, is charged with abducting Smart at knife-point from her bed. She was held nine months before the couple's 2003 arrest.