Urfa, Turkey (CNN) -- The petite 25-year-old tentatively opens the door to the hotel room where we've agreed to meet. Her face is covered, but her body language betrays her anxiety. She slowly lifts her niqab, revealing her young, heart-shaped face. Her large brown eyes, filled with guilt and turmoil, are delicately made up under perfectly sculpted brows. She calls herself 'Khadija.' It's not her real name, because she's a marked woman. Once a member of a fearsome, female ISIS brigade, she's a recent defector, disillusioned by the group's brutality. Her interview with CNN is the first time she has ever told anyone her story.
@highlight
25-year-old joined ISIS after chaos following protests against Syrian president
@highlight
Lured by man she met online, she became interested in ISIS
@highlight
She joined female police brigade that enforces ISIS rules on women
@highlight
She witnessed beheading and violence against women
@placeholder was trained to clean, dismantle, and fire a weapon.