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I am sorry that you have been waiting for a response. I recently just logged onto the site and noted that your question hasn't yet been answered. I am a licensed veterinarian with over 25 years’ experience and would be happy work with you if you are still needing assistance.
It definitely sounds like seizures that you are describing, and she is of the correct age for epilepsy to develop, but the fact that they sound like they are progressing in severity and possibly frequency suggests that she should have a seizure work up. In cases of epilepsy all test results will be normal as there is not a specific test for it, but the screening of the other vital organs is important to rule out other causes. A neurologic evaluation can also indicate if some of the other changes you have noted are involved also or may help to localize a lesion involving the brain. When epilepsy is diagnosed, treatment to control the seizures is indicated if they are occurring more than twice a month.
Seeking a veterinarian to help you is an excellent idea and hopefully they can get her on a medication program to limit her seizure activity. Here is a link with more information about diagnosing and treating seizures in dogs.
I hope this is helpful. Please let me know if you have ANY other questions. My goal is to give you 100% satisfaction and if you are not yet satisfied, please reply so I can clarify for you.