Falmata was told that if she killed non-believers, she would go straight to paradise.
Like other women, her target would be a market or another crowded place.
"I was so scared that I started crying. But they kept telling me to be patient. To accept that this is what life is about," she says.
"They said that on reaching paradise, everything would be better".
The story of a Boko Haram suicide bomber, at the BBC.