My wife is looking for a story, most probably a novel, where a mode for long-distance transport for people is transferring only the "soul" into a new body. The original body is eliminated after the transfer.
She read the novel in the 1980s or shortly after, but it could be considerably older. The main character was probably a woman. Unfortunately, we do not have more details.
The only plot detail my wife remembers is the main character contemplating this transport technology and whether there is a soul. After the first time she(?) uses the transport from Earth to another planet she is convinced "yes, there is a soul."
The story was most probably in English, or with low probability German. It could also have been part of a series.