My name is Silver!

We rescued a pregnant dog from a military vet who was committed for PTSD and abandoned his dogs. We agreed to adopt the mother because no one else could or would, and the shelter was full. She had five healthy pups and we found a home for two. Now we have the mother and three pups (2 girls and 1 boy), plus a 16-yr old dog with health problems. They are all excellent dogs, but there is a serious rivalry between the two sisters so we have to permanently separate them. We are desperately trying to find a good home for Silver. She is 6.5 months old, has beautiful blue eyes and a silvery fawn coat. She doesn't have any problems with dogs or people, except for her sister. She is smart, obedient and a quick learner. She is house trained (using a doggy door), can sit and stay, and is great on the leash. She needs an outdoor space and likes to be outside. We hate to let her go, but need to maintain harmony in our household among the other dogs and ourselves. Please help!