I'm boring but overcompensate with headlines and flash.flash.flash. photography

A girl I really don't know is having a rough time. It's blatantly obvious and it's sadder because you know she's trying to hide it. She seems like she's doing super badly. When I was in a position like that I always wondered, I am surrounded by people, why is no one helping? Now I realize. I have no idea what to do with her. Because where do I begin? "I don't know you very well, but you sure have been crying a lot lately. Want to talk about it?" Who says I'm someone who can help her? Who says I'm not? This isn't just a case of trying to be a Mentor and look Mature and Helpful. I care. I really do. She seems like she is really struggling. What do I do? I don't know her. I can't facebook her because to my knowledge she isn't even on facebook. Do I talk to her when I see her next? Do I write her a letter? Or do I just pray completely anonymously? It's not that I haven't thought to pray, it's that sometimes it's nice to know people are praying for you. But I have no idea what she thinks of me so it could be completely unhelpful to reach out to her. My guess is I'm not one of the people she wants to talk to, that if I reach out she won't know what to do. Maybe this is just one of those situations where I may as well try, and assume that she'll appreciate someone noticing. I really have no idea.