Narrative ideas

So, our new narrative idea is:
we have a victim, and the victims friend who are both bullied by a group of boys and girls from their school.
the victims friend decides to side with the bullies to prevent being bullied himself. Left alone, the victim is hurt by her only friends betrayal, and continuing to be bullied, she is pushed to her limits and decides to take revenge on the bullies, resulting in murder, also murdering her ex-friend, it is then revealed that she was in love with him, making his betrayal even more painful. As no one suspects her of the murder, and the police investigate with no leads to the victim, she becomes tormented by her own guilt and pain, and contemplates suicide.