I, too, am crying as I read your post. My heart also breaks for you and your unimaginable pain.
All of the things I have heard that mesh with my beliefs say that when you have a dream that is so vivid and so real, and that you remember with such clarity, it is not a dream. It is an actual visit. Your Minnie may have visited you to show you she still has that same great love for you and that it will never go away, and that she is healthy and happy and not hurting at all now. She will be waiting for you and you will see her again one day.