If this was my dog I would take her to the vet, and ask for a complete blood panel to be done, as well as an x-ray of her head. It could be one of many conditions; so I'm not going to guess. Good luck to you and your dog.
My greyhound has recently started having tremors in from her headt to her torso. At this point nothing has been found via tests. I have been monitoring her, other than the tremors she is acting normal. She is in the early stages of kidney disease, but they don't think there is a connection to that. I agree that you should have blood work done to see if there is any abnormalities.Good luck.