She said she would speak publicly about Barzee's release in the coming days once she has "a better understanding", Fox News reports.
Smart, now 30, didn't immediately have comment on the pending release.
They began hearing about the possibility of an early release just last week, he said.
In 2010, Barzee was sentenced to consecutive 15-year sentences for the federal and state charges. He also forced her to watch him have sex with Barzee.More news: IPhone Xr, iPhone Xs And iPhone Xs Plus Might Surface This Wednesday
A USA woman convicted of helping a former street preacher kidnap Elizabeth Smart in 2002 will be freed from prison more than five years earlier than expected, a surprise decision that Smart called "incomprehensible" on Tuesday (Wednesday NZ time).
On top of the kidnapping, Elizabeth testified that Wanda's husband raped her nearly every day, and forced her to do other activities such as smoke, drink, and watch him and Wanda have sex. However, the news release goes on: "based on further review and advice from legal counsel, the Board must count the time in federal prison as credit to the Utah sentence and therefore Ms. Barzee's sentence ends on September 19, 2018".
After completing her federal prison term, Barzee was returned to Utah on April 8, 2016 to serve the remainder of her Utah prison sentence.
Smart, in a statement, said she was disappointed by the decision.
"Upon further review and advice from legal counsel, the board must count time spent in federal custody toward Ms. Barzee's state sentence", wrote Greg Johnson, the director of administrative services.More news: Serena Williams: US Open final umpire makes interesting admission over controversy
She said in her statement she appreciates the support she's receiving and vowed to work to address the issue of Barzee's release so the same thing doesn't happen again.
Mitchell was sentenced to life in prison in 2011 - almost nine years after Smart's abduction.
In June, the parole board calculated her sentence would continue through January 2024, however that did not account for time served in federal prison.
November 17, 2009: Barzee pled guilty in federal court.
The couple kept Smart for nine months until authorities found her in walking down a street in Sandy, a suburb of Salt Lake City just 18 miles from her family's residence. She's also become an outspoken child safety activist and advocate for stronger laws against those who harm children, even testifying in the U.S. Congress in March 2006 in favor of the AMBER Alert system and tough laws against child predators. He then shackled her to a wire between two trees while Barzee fully cooperated and was complicit in the kidnapping.More news: Verizon Brings Home 5G Service to Four US Cities on October 1