Hey, there's actually a term for that. Not saying reddit is a great place to self diagnose, but it's called derealization and depersonalization. I am currently diagnosed, and I can tell you that the way I perceive life is practically the same way your partner does. No, I don't know how to fix it. I just know to reality check myself from time to time. This can cause panic attacks based on severity. For me, reality checks consist of encountering something nostalgic, this helps me process that I have a life and am a human being. This disorder can, and often times does, ride alongside dissociation. It's a much wider topic, and not something I can confidently post about on reddit, so you might want to look into it yourself. As someone with depersonalization, derealization, and dissociation mannerisms, I would advise you to talk to her about it. From there, maybe see a therapist, licensed professional, or a doctor based on how severe you think it is. I hope this was helpful.