Dog aggression does not equal people aggression.
I can't imagine leaving a Pyr, a yorkie, a pom, a GSD and a KCS unsupervised in a huge yard. That is a recipe for disaster, though considering the GPs I have known, I would have expected the problem to have come from that section -- I know that isn't fair, but just going on some nasty GPs I have known.
You should not have left the dogs outside together, especially if two did not get along. I am sorry this happened, but are you 100% certain it was the GSD that did it? And if so, what are your intentions? Rescues are unlikely to take her from you, not impossible, but many rescues will not take a dog from an owner, and only take a dog that is in a kill shelter.
You can contact a rescue and ask them to help you find an owner without other dogs, if you intend to give her up. You have a large pack -- five pet dogs is a lot if you want them to all run around together like the brady bunch. And with another skin-kid on the way, your time is short anyway.
If you are going to blame the bitch for this, and will hold it against her in any way, finding her another home is probably your best bet.
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