Hello, My name is XXXXX XXXXX I have been a veterinary nurse for 26 years.Thank you for allowing me to assist you today.
I am sorry to hear Herrye had a seizure but glad you were able to tell exactly what was going on.
Your vet is correct that in most cases vets will not start medication unless the seizures begin to show more frequently or they last longer.
There are many possible causes for seizures, however this breed is prone to idiopathic epilepsy and it can be hereditary so it is no surprise that both dogs have had this develop.Link
It would also be worth having some blood work done on both dogs to rule out other problems such as problems with the kidneys, liver or thyroid and make sure the glucose levels are normal.
I would suggest keeping a journal of when each dog has a seizure, how long it lasts and what they were doing before the seizure. I suggest tracking what they do before as some dogs do have triggers such as certain lights, sounds, stress, a full moon etc.
If more then one seizure develops within 24 hours then immediate medical care would be needed other wise just keep an eye on her.
I hope this helps. Please reply back if you have additional questions or concerns and I will be more then happy to continue.