PM me man i'll give you my email, I dont think you should be crating the shepherd as it was her house to begin with. I have a lot of things which may help you out and we may have to email or chat. I just would hate to see the new dog go and the shepherd is so confused now if she is in the crate!
Oh and btw if you are open to seeing it as that you aren't "training a dog to not be aggressive", you are training yourself and your new dog to be accepted into an existing dog's home and pack hierarchy.
We have a bunch to discuss but honestly I wouldnt give up yet. I think a lot of Cesar Millan's principles would help you in this situation. Start with this and PM me
New Member of the Pack | Cesar Millan