She was sentenced for providing logistical support and taking part in attacks on Iraqi security forces.
The woman, who has not been named but is said to be of Moroccan descent, was captured during the battle for Mosul last year.
Thousands of foreigners have been fighting for ISIS in Iraq and Syria.
The court said she traveled from Germany to Iraq to join ISIS with two daughters, who married members of the jihadist group.
She is thought to be the first foreign woman to be sentenced to death in Iraq for joining the group, reports say.
Another German female, teenager Linda Wenzel, was arrested in Mosul at the same time for belonging to ISIS.
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