Advice please.

My best friend has another friend from church who I have grown to know. This other girl has a lot of problems, with her parents and other authority. I've come to understand that she has depression, whether it actually be severe or not I don't know. This girl is very beautiful and smart and she also believes this, yet she believes also that she wasn't meant to be here. She has had her death planned since last year, planned as being an accident but she is actually going to commit suicide. She self-harms, I've seen she hasn't in awhile but she does in other forms besides cutting as well, a habit where she will stick a nail on the outside of her veins to cut off circulation to her hand usually. Now I know, everyone is different with forms of depression, they deal with it differently, the things this girl does is very suicidal and careless. I have told my best friend, whom is closer to her, that she needs help of some sort. Whether it be a councilor or an institution or anything, or I believe we will be called one day saying she is dead. My best friend said she'd tell the pastor at our church so he can pray for her, now I am a christian, but I also know this girl does not only need that. My best friend always says, "I don't want her to have to go to a facility like you did." What she doesn't want to realize is that that could be what she needs. Anyways I just want opinions on the situation.

Also, we've told her parents, her parents are very careless and do not care what happens to her most of the time.

No rude comments, please.