I am so sorry for your loss. You must be devastated. I can't fathom.
Let me reassure you that dog aggression and human aggression are entirely different things. So a dog aggressive dog can be perfect with people.
Some GSD are very rough players. I know mine are. Often they don't know their own strength and accident happen with smaller dogs.
I would keep her separate from the other smaller dogs unless under your direct supervision. You can stop her bad behavior, but only if you are there.
Again. I am so sorry. King Charles are wonderful little dogs. So sweet, as I am sure your was. She did not deserve this. But you will see her again.
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