It does sound like a seizure. I would suggest if you can video the episode that you bring that to the vet for them to see.
This site goes over seizures and causes and may help you be better able to discuss with the vet what is going on
http://www.canine-epilepsy-guardian-angels.com/site_map.htm
You can see if the chill in the AC is bothering her - see if bringing her outside in the warmer air revives her. Might be the change from heat to cold that is a trigger for the episodes.
If it is epilepsy she may need meds to resolve this.
Hope this helps you!
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