((((Grandma Jones and Sister))))
I'm sorry for how hard this is. I hate to hear of her being alone and crying herself (or yourself) to sleep. But it is a blessing that the two of you have always had one another, and that you're so close and in this together.
She keeps praying that Jehovah show her that she is wrong, and that the organization is really his channel, but nothing changes. She just can't make herself believe it, and god is not taking action regarding her prayers.
But He can't tell her something that isn't true. Perhaps she could pray for Him to show her HIS truth, then just put her faith in His Son? She may have peace in that.
(and people outside of the witnesses still believe they'll see their loved ones again - just spiritually)
Tammy