i guess she got r*ped..its obvious
You mean by others through his guidance or what? (didn't start to read and want to know if i can deal with this, i've gotten the general gist but would be awesome if you could give a more in depth spoiler, you can place it in spoiler tab not to spoil it for others)
Edit: still didn't read it whole but My speculation based on ch 29 she was either r*ped by some relative who committed suicide OR psycho gave her to some sort of lolicon to r*pe her then blackmailed him to death. Though relative option is closer due to her coming in school uniform to a house and seeing a hanged body. Though in chapter 30 she said she didn't have sex, so it's still a mystery, maybe using foreign objects (that is a popular way to torture people).
Author created a mystery and with some analysis i can understand why editors decided to sack her job...being free and creative is good but some thing should be reserved for self publishing (aka web novels).