Tammy Crow, 26, was driving an SUV on Valentine's Day weekend in 2003 when she lost control and crashed on a California highway. Her boyfriend, Cody Tatro and a 12-year-old boy, Brett Slinger, both died in the crash. Crow's right arm was broken in four places.
Crow's arm was reconstructed and she battled to rehabilitate herself in time for the Olympics.
In announcing the 3-month jail sentence in January, a judge specified Crow could begin serving it after the Games.
After reviewing Crow's case and agreeing to allow her on the team, U.S. Olympic Committee President Bill Martin said he believed "Brett and Cody will be with us in spirit" in Athens. The youth's father, Mike Slinger responded by asking the committee not to use his son's name again.
Meanwhile, Crow says her public defender never told her the "no contest" plea would mean jail time, and has filed an appeal for a new trial, which is pending.