Marlin Stivani Nivarlain, 16, said her jihad-crazy older boyfriend convinced her to leave home for the squalor of ISIS-controlled Iraq.
He whisked her away from her parents in Boras, eastern Sweden, then took her by land to a city controlled by ISIS, also known as Daesh.
She began her journey into the heartlands of terror last May – and was captive in jihadi hands until she was rescued this month.
By that time her boyfriend, who was 18, had been killed by an ISIS airstrike.
She was reportedly pregnant when the two fled, and gave birth behind enemy lines. It is not clear what became of the child.
Speaking from Erbil, in Kurdish-controlled Iraq, Miss Nivarlain described her journey and her dire living conditions under ISIS.
She told the Kurdistan 24 News Station: “First we were good together, but then he started to look at ISIS videos and started to speak about them and stuff like that.
“And I don”t know anything about Islam or ISIS or something, so I didn”t know what he meant. Then he said he want to go to ISIS, and I said OK, no problem.”
“I didn”t know what ISIS is, what Islam is, nothing.”
The pair used a combination of trains and buses to get across Europe into Turkey, where they jumped the border into Syria.
Miss Nivarlain continued: “ISIS took us in a bus with some other women and men to Mosul in Iraq.
“After that I get my house – in the house we didn”t have anything.
“No electricity, no water, nothing. It was totally different between Sweden and here.
“In Sweden we have everything – there I didn”t have anything.
“I didn”t have any money either – it was a really hard life.
“When I had a phone I started to contact my mum, and said I wanted to go home.”
While she was missing, Miss Nivarlain”s boyfriend posted a video online boasting that she would never return.
In the footage, he said: “You can just forget the little girl, she is my wife [and] she will never come back.”
Miss Nivarlain told Swedish authorities about her daughter, who organised a daring extraction raid with the Kurdish government.
Kurdish soldiers rescued Miss Nivarlian from just outside Mosul on a raid on February 17.
She is being cared for in Iraq until she can be returned to her family in Sweden.