If anything, I think that she does have idiopathic epilepsy, which can be controlled nicely with anti-seizure
meds. They have so many different types
today, it's no longer a case of automatically putting them on phenobarbital like it used to be. With her being so much smaller than normal, you might have to play with the dosage a bit of whichever med the doctor decides to use, but it sounds like she could not have found a better dog mom than you.