i think we have a pretty good idea that when she went to Syria she knew, and made a deliberate choice to participate in, what was a breeding programme for Jihadists. the propaganda for that was very clear, all of the girls and women who went out to IS knew beforehand that they would be married (by IS) to an IS fighter, that they would be set up in a house and that it was about about making lots of babies as quickly as possible.
depending on the individual they were also promised either jobs - like midwives etc.. or just the suburban dream of 5 kids, a Toyota Hilux, a dutiful hubby who comes home after a days killing, and a slave. you know, just like any girl wants...