hm. initial thoughts is that she's less crazy and she instead has some kind of mental disorder, maybe she's on the autism spectrum? since she misses social cues and struggles to process that she's being bullied.
we can't tell so far if she killed her mom, but if it's an accident, i just feel bad for her. clearly her father is very abusive, so she can't call the police and report her mother's death, because then her father would receive custody or she would go into the foster care system.
if it's been a while though, then i wonder what her mother was like? if she had a job, wouldn't they report her missing? she must not have gone to the hospital otherwise she would've died there
i only read romance manhwas for the beautiful women. scummy male leads can DIE