Terrified.?

Tomorrow night my friend and i are going to speak with out other friend about an apparent problem we are observing. We believe she is sufferinf from depression and self injury. We are going to speak with her in a non-confrentational standpoint, nonjudgement etc... We are all 20 years old and have been close friends since we were 12 and never once, have we been in an arguement. But we feel we need to face this with her because she needs help. Never have we talked about it before with here and this will be the first time. I am terrified. absolutely terrified. i know what i want to say but i don't know what is going to happen. She will get mad, i know she will. how to do deal with her and speak to her if she gets mad and doesn't want to talk to us anymore- she needs help and nobody is reaching out to her but us... she needs help and I am terrified for her.