FaceTime & iMessage auth troubleshooting
I have resolved this issue. It turned out that my GF's apple id was blocked on one of apple servers. I have got in touch with apple support and they resolved my issue. If you are living in the country with no apple id support, go to apple support website, select you're living in US and find any service like itunes issues or something like that with chat support. Connect to chat and describe your problem, say you are from the country with no apply support (it's important). As usual they will connect you with tech specialist who is responsible for all these issues.