The woman's cousin David Speelman told the Associated Press that FBI agents had visited the family on Thursday to tell them of Ms Mansfield's death.
BBC: US woman Nicole Mansfield killed fighting in Syria
After her marriage ended, Ms Mansfield remained a Muslim and travelled to Dubai to learn about Arab culture, her aunt Monica Mansfield-Speelman told the AFP news agency.
"We didn't know she was over there, " Ms Mansfield-Speelman said.
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