BEVOLASVEGAS
Posted : 8/25/2009 2:21:16 PM
I would take her back to the vet to make sure that her ears aren't the problem. Infection or even something, ie hair or a tick, deep down in the ear canal could be causing her balance issues. A blow to the head can, sometimes, cause neurological problems as well.
I would start with a recheck from your normal vet to make sure that the ears are ok. If that shows nothing, I would look for a referral to a neurologist.
ETA: A MRI would likely confirm a brain tumor.