The court in Russia's northwest upheld Varvara Karaulova's plea to cut her prison sentence by one year and 10 days.
The 23-year old Moscow State University student was sentenced to 4 years in prison in December 2016. She was arrested in Turkey, where she was trying to cross the border into Syria after her father filed a missing person's report.
Philosophy major Karaulova, from a middle-class, non-Muslim Moscow family, was an odd-one-out among Russian IS recruits who typically hailed from impoverished provincial backgrounds in the North Caucasus.
Karaulova, a convert to Islam, insists that she fell in love with a man she met online and wanted to marry him in Syria, but did not share the radical ideology of the IS.
Her father had pleaded with the court to acquit Karaulova, saying that he was seeking help from Russian authorities by filing a missing person's report, not vengeance against his own daughter.
Karaulova who was expelled from university shortly after her arrest told the court on Tuesday that her trip to Turkey was "the most foolish thing I have ever done in my life and the one I'm still punishing myself for."
Her father, Pavel Karaulov, who attended the hearing in Vologda, told the RIA Novosti news agency on Tuesday that he was "over the moon" with the ruling and hopes that she can soon return to her studies and "live to the full."
Mikhail Fedotov, chairman of the Russian presidential human rights council, who visited Karaulova in custody, welcomed the ruling, saying in remarks carried by Tass on Tuesday that she was a "victim of terrorism.
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