Is it permissible to divorce a wife who claims to see spiritual beings that tell her unseen matters, which causes recurring problems in the marital life?

What you mentioned about your wife seeing hidden things, and the shaykhs telling her unseen matters, is either charlatanism and sorcery, or a psychological illness causing delusions. Explain to her the falsehood of these matters, and that she must repent and return to her senses. If she repents, then keep her; otherwise, divorce her. If she is ill, then take her to a psychiatrist. If she recovers, then there is no blame upon you whether you divorce her or keep her.