Marlin Stivani Nivarlain, 16, was reportedly lured from her homeland by her boyfriend.
The 19-year-old Swedish man, who has since been killed, persuaded her to join the terror cult, also called Daesh.
According to Swedish media reports, Miss Nivarlain gave birth to a child while behind enemy lines.
She was freed in a rescue operation on February 17 by Kurdish fighters near the ISIS city of Mosul.
The successful rescue mission was first made public on Tuesday.
Miss Nivarlain first fled her home town of Borås, in eastern Sweden, last year.
She was heavily pregnant at the time and is believed to have had the child around Mosul.
The girl was convinced to run away by her boyfriend, also Swedish, who went to fight for ISIS
The Kurdistan Region Security Council said will be returned to Sweden.
A statement from the group said: “She was misled by an ISIS member in Sweden to travel to Syria and later to Mosul.
The Kurdistan Region Security Council was called upon by Swedish authorities and members of her family to assist in locating and rescuing her from ISIS.
She is currently in the Kurdistan Region and is being cared for under international law.
“She will be transferred to Swedish authorities to return home once necessary arrangements are put in place.”