answer:Take her out into the back yard on a leash and watch her behavior closely. Reward her when she goes outside. If she seems traumatized, don’t force her, but begin desensitization work. Consider taking her in to your vet for a check up. She needs to be checked for a UTI or bladder stone (If she hurts when she pees, she may associate it with the back yard). Does the deck have stairs? A GSD of her age is a likely candidate for hip problems.