German Shepherd weak in back legs

I am submitting this again as I can't see my post under my threads. I have a 12 year old German Shepherd who is losing strength and muscle in the back legs and hips. She groans and whines when getting up from lying down, and has almost no energy. This began about 6 months ago but is getting worse. We are in Spring/Summer weather here.
She went deaf about 12 months ago – checked by vet and diagnosed with simple old-age deafness with no obvious cause. She hears almost nothing at all except loud bangs close to her and that may be from lying on the ground and the vibration. She has been checked thoroughly for hip displaysia and no sign of it.
She is prone to flea bit hot spots that she chews till raw at the base of her tail.

Her nature is:
Reserved and gentle with people, other animals and children. She lets the chooks, ducks and cats eat out of her bowl before she eats. She is a one person dog and avoids most people and crowds. She prefers to be outside at all times, even when it’s very cold. She feels the heat and seems to prefer the cold, often sleeping outside and avoiding her dog house even in the sub zero temps. She was traumatised as a young dog (got out of a yard in a storm, caught by rangers with wire around her neck which cut her badly, and she’s been anxious and fearful since). She prefers raw meat. She is a solitary nature most of the time unless I’m in the yard. She is protective by nature as she used to sit by the gate and give a few barks at trucks especially, and at night she would sleep by the chook pen to guard them from foxes, but since her deafness she doesn’t do this and acts quite depressed and lack of vigour and enthusiasm. She has never been one to bark crazily at people coming to the house.
I have started her today on Rhus Tox 200C and Conium 200C with Kali Phos 6x.