Some of these little dogs have brains that grown to big for there skulls, and it can cause seizures.  Keep track on the calender when she has these episodes with info like how long it lasts and severity of the attack.  If this is happening more then once a week I would bring her to a different vet.  There are anti seizure meds for dogs if needed.  Dogs also can get diabetes, and if she has bad teeth that arent taken care of she could go blind from the infection.  Hope this helps.