I love you Sammy

So, my best friend Sam is in some kind of rehabilitation center for trying to "commit suicide".
She took pills and threw them up and her parents found out and sent her there.
I am all for her being there. But I don't get why she felt the need to do that.
She knew that we were there for her, and that she can talk to us about anything.
I have talked to her about it and tried to get her to see it from my eyes and how
badly it would hurt me if she tried to hurt herself. I guess she didn't take that into
consideration. I don't know what to do now...
When she comes back what the hell am I or any of our other friends suppose to say to her?