Hello NEROMARE: I'm sorry you are having such a difficult time. I see this is your first post here on PC. So... welcome to PsychCentral!
May I suggest you introduce yourself to the general membership over on our New Members Introduction forum? Here's a link:

https://forums.psychcentral.com/new-...introductions/

The fact that you and this girl live in entirely different countries, in different hemispheres certainly limits anything you could do here to be of help to your friend. It may be that under the circumstances, and given what your long-distance relationship is doing to you, it may be best if you simply conclude your contact with her as gently as possible.

Still... here are links to some articles, from PsychCentral's archives, on the subject of how to help a friend or family member who has schizophrenia or other mental illness:

https://psychcentral.com/disorders/s...schizophrenia/

https://psychcentral.com/schizophrenia-guide/

https://psychcentral.com/lib/helpful...rs-and-others/

https://blogs.psychcentral.com/careg...is-delusional/

https://psychcentral.com/lib/15-ways...ental-illness/

Also... here are links to articles on the subject of long-distance relationships:

https://psychcentral.com/lib/the-cha...onships/?all=1

https://psychcentral.com/lib/7-tips-...tance-couples/

https://psychcentral.com/blog/solve-...ship-problems/

https://blogs.psychcentral.com/anger...er-than-apart/

My best wishes to you... as well as your friend.