She had a poor economic condition and wanted the better life ISIS was guaranteeing.
She was inspired by the story of teenage girls, around the same age as her, who bravely migrated to Syria in order to life under Islamic state.
She thought she could learn more about Islam because her father, busy with work, was absent as a leader and Imam to guide the family.
As a moslem, she felt obliged to go, because ISIS provided life with real Islamic rule as chalipate in the past.