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Aside from the GSD breed, especially female, to not be dog savvy and to push other dogs around...the information provided above is also a big factor in this issue. The dogs are NOT treated equally by you. That causes conflict big time, this isn't a fully integrated pack and the dogs are confused and attempting to normalize the pack structure because the humans are not getting it.
Trying to support Chases dominance is not the right thing to do, it would have been better if you'd have allowed the normal switch of status. It would have been pretty natural and might have prevented what you are seeing now. It's very unfortunate.
As always, you give such great insight!