No problem. I’ll give you the benefit of my experience. My Timber was a very assertive GSD. While he was extremely well disciplined, I would exercise him vigorously, give him lots of work to do, and occasionally wrestle him just to keep him reminded of who was in charge. In the aftermath of Hurricane Katrina, I rescued Ranger, who was pretty much the opposite...in addition to having been neglected and abused, malnourished and heartworm +, it was obvious he had little to no discipline, but was also kind of timid and withdrawn. Timber provided a lot of structure to him and Ranger was perfectly happy and comfortable being the beta for a few years. When Timber died, Ranger was left in much the shape your dog is, but I was not in a position at the time to take on another dog. I started taking him to the dog park on a very regular basis, and/or PetSmart where he could interact with other dogs, and it did him a world of good. I like the recommendations here about adopting an older, more mature dog, or fostering. Both viable options I think. In the interim, keep her busy...fetch, playing with her, even regular iterations of simple commands (sit) with comforting rewards to give her purpose and structure.
I’ve been doing some of that.
There are limits to how hard I can work her due to her creaky joints.
Unfortunately I’m 30 miles from a town .They don’t know what a doggie park is out in the country.