Gavinmad
Mr. Poopybutthole
She was still super young when she reached the Citadel and appeared to have escaped into anonymity before Joe would have made her a wife. Joe is a sick, sadist piece of shit, but I don't think it was implied that he was raping pre-teen girls.
After she came to The Citadel she was traded into Immortan Joe's hands to become one of his Wives. He tried to breed with her but she was barren. As a result Immortan Joe gave Furiosa to one of his Imperators who let her ride on the War Rigs and taught her the art of war. When her mentor was killed she took over his command.
That is her original background when it was just Fury Road.
- 1