I'll say get a second opinion and an MRI to rule things out.
When did these seizures start? Any new food, activities, environments? Did she start drinking diet pop(aspertane)?
Is she on a radical diet? Some detective work is in order. There are many possibilities but first please listen to and get a second and even third opinion. When doctors hand out meds in triplicate without even a hint of knowing what is wrong, this is unacceptable, absurd even.
I'd be curious what meds are being given as well.