Shamima Begum claims her mum not teaching her how to pray contributed to her decision to leave the UK and become an ISIS bride.
Begum was just 15 when she and two other girls from Bethnal Green, east London, left to wage jihadi war in Syria.
Now 21, she has claimed she joined the Islamist terror group because she always felt like the "black sheep" of her family.
In a new documentary she said her mum had always told her she should pray, but never showed her how.
This left her yearning to become "part of a Muslim community", and her friends later helped her become a practicing Muslim.
She claimed she later felt "really guilty" after seeing "videos of Syrians being bombed" and "babies covered in blood".
"I just wanted to be a part of something," she said, speaking from a prison camp in Roj, Syria for Sky documentary The Return: Life After ISIS.
"It just started with learning my religion, and then it turned into wanting to come to Syria, wanting to help the Syrians."
Begum also claimed that she married her husband because the conditions in the jihadi bride house were "so bad".
When he was shocked to discover that she couldn't cook, she replied it was his own fault for marrying a 15-year-old.
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Begum and Hoda Muthana, an American woman who left the US to join ISIS in 2014, have lifted the lid on what it was living in the Islamist caliphate in the documentary which airs next week.
Speaking about a house where prospective wives stayed in, Begum said: "I thought that maybe I could put off getting married for a while, but the conditions in the house were really bad so I just wanted to get out as soon as possible.
"I stayed there for maybe a month, and someone offered my husband to me.
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"What they do first is they ask you for your preferences, of what type of man you want – like age, nationality, language – and then they filter that down and they offer you someone and then you're just like, 'Okay, I'll have a meeting with him.'
"But I only ever had a meeting with my husband and my husband only ever had a meeting with me, and then we just decided to get married."
She continued: "It was really weird, I didn't know how to cook and he was just so shocked that I didn't know how to cook.
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"I'm like, 'You married a 15-year-old, it's your own fault.'"
Muthana called it "hell on earth" as she moaned about not being allowed to use the internet or electrical devices, saying "it felt like I was living in the Middle Ages or something".
She told filmmaker Alba Sotorra Clua that "every website I visited had a Syrian advertisement… I really got sucked into that".
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