(Bluntly speaking) How do you shut up someone who rambles?

As I am writing this, someone on the telephone is rambling at me, trying to be inspirational and encouraging. I have a right to feel negative and discouraged sometimes, and I don’t need a multi-hours lecture on how I need to have more faith. Her words are actually encouraging after hours of her crying and complaining. This IS someone who is grateful for me and maybe I should be thankful that she appreciates me. But now, I want to recover material I lost when my computer crashed (I have a life of suckiness, but am basically a person who has spread himself too thin trying to help others). She thinks she is helping or is trying to help, but I just want to be left alone. Furthermore, its 3:19 in the morning as I write this. I’ve lost hours worth of work on my computer due to a crash and have things I want to work again. I talk too much myself, but I don’t ramble for hours. I don’t want to hurt my friend, either, especially someone who is trying to help or thinks they’re being helpful or inspirational.