What is it to the OP if she lives or dies? He is clearly indifferent to her. Not everyone believes that every human life has value.Good question. Because every human life counts and this is not a person who has decided, in full maturity and thought, that she doesn't want to live anymore, but rather she's a person that is still not fully mature and is pushed by others into this decision, others who treat her like dirt over a decision she made when she was even smaller and more immature, when she was a child.
If you don't feel bad or wouldn't want to at least try and help her... then you're a horrible human being. It doesn't matter that "shit like this happens to thousands of people every single day". You can't help every single one of that thousand people... but the OP can help this girl. Even if only with a suggestion like "stay strong, don't let the jerks get to you" or something or a kind word or even trying to convince others to stop showing her pictures around if he doesn't want to talk to her at least he can talk with his friends and stop them from distributing the pictures. And why should the OP act in this case when there are thousands of people like that every single day? Because he can. Because he can help someone get better. If this doesn't mean anything to you, you're a one of the most selfish persons there are, rotten to the core.