I have a depressed friend. And I mean REALLY depressed. Help?

Hey I've been in Lily's place so I speak from experience, sometimes you feel like the world's against you every little rude comment puts you down further even if it's a joke. I'm keeping a diary to help but as her friend I would check everything you say before you say it. You can hurt her without even trying. If you be that shoulder to cry on and tell your other friends when they make the stupid remarks like, "Idiot" even though there goofing off just tell them to cut it out. I notice when I listen to, Mat Kearney "Ships in The Night" and watch the movie, "a Smile as Big as the Moon" helps me. So all I say is be her guard against negative comments and be her shoulder to cry on. I hope everything works out for the best :)