the main thing you have to remember and remind her about ,is suicide is normally caused by depression, which is anger and hatered point at yourself. her brother was gonna do it no matter, bc he did, they were out of reach, maybe back when it started to enter they could have done something, doubt it, most who actually go thru with it, have it predetermined and are not gonna be swayed, did he bring it up any, sound or act out about suicide, prolly not, most ppl who do are crying out and arnt gonna, they want attention. he prolly just up and did it. never the less, i am a clinical away from a BS in psychology(im not a psychologist by any means, but i know alot about it, PM me if you need any off the table help bro.. there are several awesome sites for surviving family members, just hit up google bro..) good luck and god bless you all in your time of need.