You are right. I rescued our shiba mix Kim, who came from Taiwan out of a very bad situation. Here in Germany she came to a family, who gave her up again. I could never understand that, because Kim was a very friendly, uncomplicated and extraordinary dog. But nevertheless it took more than half a year till she trusted me. Than she could relax, began to play and to show, when she is feeling good. So she had at least some good years in her life. I am also sure, that is a hard time now for Oma, because she doesn´t know what is happening to her. But with a lot of love and patience it should work.