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Given her age what you may be seeing is what is known as old dog disease or the correct term is vestibular disease. This is when the dog is off balance, unsteady on the feet. This comes on either due to an inner ear problem or it is idiopathic which is often the case in older dogs. But to be sure you will want to have your vet check the ears. Vestibular usually goes away in a few weeks, but do have the ears checked also.
Here is more on Vestibular disease http://www.petplace.com/article/dogs/diseases-conditions-of-dogs/brain-spinal-cord-nerves/vestibular-disease-in-dogs
Confusion in older dogs can also be from Canine cognitive dysfunction and since she just came out of surgery a month ago, this may have sped up what was already happening. I would keep an eye out for other unusual signs and ask your vet to have a look for this. I would also video tape what you are seeing on your cell phone and bring that in with you at the next vet appointment because sometimes what happens at home cannot be seen at a vet office as a dog is nervous or feels just fine at that moment.
This breed is also prone to retinal atrophy which causes blindness . You can read more on symptoms here http://www.petplace.com/article/dogs/diseases-conditions-of-dogs/eyes/progressive-retinal-degeneration-in-dogs
Of curse given her age a growth inside the brain that is pushing on a central nerve could be the cause. You won't know for sure until the Vet takes a look.