I have a friend who is feeling suicidal. What can I tell her to do?

Professional help. Anyone who is feeling suicidal should get professional help. If she is feeling desperate, scared or out-of-control, call 911 or a suicide-prevention hotline right away. If this is something that's been going on for a while and she is able to promise that she won't try to hurt herself right now, someone should stay with her to watch and support her until she can see a dr or therapist within 24 hrs.