I don't think walking is good exercise for a dog like a GSD, at least not a young healthy one. More frisbee might help.
Regardless of that, if all my dogs needs are taken care of IE food, water, bathroom break, exercise, bonding time and the dog decides to be a little whiney jerk anyway I will mark and punish it (what that is depends on your dog but escalate until effective). Sometimes dogs just act like brats and if that's the case you stop a brat by making being a brat an undesirable option. Condition relaxation in the house too by doing exercises like sitting on the dog or any number of conditioned relaxation exercises.
As I type this I have 22 dogs in this room. They are all relaxed and silent including a 9 week old puppy. I have had most of them in my care for less than 1 week. Take care of their needs, but don't allow the dog to become a demanding jerk.
Wow! All i can say is Dovina isn't being a brat. Just just makes the crying sounds. I give her plenty of attention, all her needs are met, the vet and AKC info all say that that German Shepherds need long brisk walks in the morning and plenty of exercise.
Second, sitting on a dog can hurt or even kill a dog. That is abusive. If you actually sit on your dogs then I hope all of your dogs find a better home. Especially if you consider them making a crying noise being a "brat" and they need to marked (which sounds like you hit them) and punished. So, All i hope is someone calls the cops on you for hoarding 22 dogs in a house, and for abusing dogs.
If you have actual knowledge in german shepherds and know why she may be crying. without being an obvious abusive pet owner. Then I'd be glad to hear that.