Sorry to hear you're having so much trouble with your GSD pup.
I have read some excellent ideas on potty training on this forum that definitely helped me with my puppy. I hope you will get some advice with that. I don't classify myself as an expert or even an amateur on potty training but I have been watching my puppy like a hawk and confined her when I can't. I understand that it's not a lot of fun with an 8.5 month old but cleaning up potty mistakes again and again is even less fun!
Regarding toys, I have a lot of experience with ruined toys through my terrier. If she has 30 seconds on her own with toys it's gone. The first step was to remove all toys. There are only toys if I am supervising the play with them. I taught her to retrieve and had treats on hand so that I could play ball or frisbee with her. To this date it's one of few games I do play with her. She has never been one to tug but I am also working to teach her to enjoy it.
Instead of toys I try to give my dog and puppy a lot of chew bones. I also give a lot of raw bones but not everybody likes doing that. This has helped tremendously to redirect the puppy when she's going crazy wanting to tear everything she can find around the house. A large bone almost never fails to buy me peace of mind.
Another thing I do to redirect that energy and has worked for me so far is a stuffed and frozen kong (my terrier has a black one) and I also bought a Kong Wobbler for both. The Wobbler is a food dispenser. Both dogs are quicker emptying it than I'd have liked but it does make them work for a few minutes for their food. A cheap method is also to throw food into the grass if you have a fenced yard. You spread it across the yard and make the dog search for it.
With training, what exactly have you tried with her? I really enjoy working with a clicker and more recently marker training (pretty much the same). Both of my dogs come bouncing when they know what's up and try really really hard. I would try to use something really tasty, like cut up hot dogs, steak pieces or something your dog sees high value in. I would always try going with food first but some dogs work a lot harder for toys. It helps if the toy used is high value and only used during training.
Figure out what motivates her and make training fun and engaging. Reward like your life depends on it while she's catching onto what you're asking. To begin with demand only what you know before you start she can succeed with and then slowly you can start demanding more. Usually a lack of success with training is confusion or if you're asking too much or simply if the dog doesn't enjoy it. It's the handler's job to change that.
You should also make sure she is getting enough exercise as that's the biggest factor for a dog being able to calm down in the house. Training is also an outlet for mental energy which most dogs also require, especially breeds like the GSD. If you can give your dog some kind of a job to do, chances are that your dog will reward you for it.
Finally, if you have exercised your dog, played with her and trained her and she has access to something she can chew; If you are fairly certain that her needs have been met, sometimes it's okay to just tie or crate her somewhere close to you where she can't do any harm. I do control my dogs to the extent that if I know I have fulfilled their needs, I get to say "hey, right now we're going to relax". At this moment my puppy is tied and sleeping next to my husband. I know that when she wakes up and starts moving it's time to go out to potty and go for a short walk before we go to sleep for the night.
Good luck, I hope you find some ways that work to make owning your girl more enjoyable.
Tosca - Gunnarsholts Yoko (GSD)
Bella (Border Terrier)