Reddit reviews The Soul Rescue Manual: Releasing Earthbound Spirits

I think your reading is right on. Your friend is stuck, and angry and surprised because suicide didn't fix anything. I do not know how to tell you to do it, but it sounds as though she is a candidate for soul rescue. I think that is the meaning of the 8 of cups.

In brief when someone who has crossed over gets stuck, if there is someone who is able to communicate with them, that person will ask the spirit to look around them and if they see the light, then encourage them to go toward it. Sometimes, if the person doing the rescue knows the name of a family member the spirit trusted in this life, they will ask that person to come and take the stuck spirit by the hand and walk them into the light.

I can't vouch for it but here is a kindle book on the subject.