There are really so many things to consider in a breeding before the color even comes into question. I don't know what testing is recommended for danes offhand, but I know with many breeds there is extensive testing needed to be sure your girl is breeding quality, and that it is healthy for her, as well. Being only 1 year old, you have a good year or more to research everything before she would be ready anyway. Have you considered showing her to see how she compares to others of the breed? For me, even if all of these things checked out perfectly, I wouldn't breed, as there is a high likelihood that you will be bottle feeding a huge litter of hungry pups every couple hours for several weeks. That means you would have to take a few months off from your job to be home to care for the pups, with very little sleep, and the heartbreak if any of them still don't pull through. Not to mention the astronomical vet bills if anything goes wrong, and the risk of losing your girl during labor/delivery besides.