"She died of respiratory complications and kidney failure... caused by the mustard agent used by ISIS in Taza," said Masrour Aswad, of the Iraqi Commission for Human Rights, on Friday.
Fatima Samir was among at least 40 people who were injured when ISIS used "poisonous substances" during the shelling of the mainly Shia Turkmen village of Taza, some 20 kilometers (12 miles) south of the oil city of Kirkuk in northern Iraq late on Tuesday.
ISIS terrorists carried out the raid from the nearby militant-held Bashir area.
Aswad said the rockets fired on Taza contained mustard agent. Other security officials also said the terrorists may have used chlorine in the attack.
Samples collected by intelligence officials are still being analyzed.
ISIS has reportedly been trying to produce chemical weapons and is believed to have formed a special unit for chemical weapons research. Iraqi scientists from the Saddam-era weapons program as well as foreign experts are thought to be working for the terror group.
Gruesome violence has plagued the northern and western parts of Iraq ever since ISIS terrorists launched an offensive in June 2014, and captured portions of the Iraqi territory.
The militants have been committing heinous crimes against all ethnic and religious communities in Iraq, including Shias, Sunnis, Kurds, and Christians. Iraqi army soldiers and fighters from allied Popular Mobilization Units are seeking to win back militant-held regions in joint operations, Press TV reported.