Much of the "putting together" of the papers involved trying to steal or leak the questions beforehand, a tactic Ibuki and her class leader, Ryūen, were known for. Mio Ibuki - You-Zitsu Wiki
Ibuki Mioda was so focused on her music career (leading the band "Heavy Metal Club") that she became estranged from her family. She simply didn't know her brother had enrolled in the Reserve Course. By the time Danganronpa 2 starts, her memories have been wiped by the Neo World Program. haruki ibuki