i thought the same thing about myself for a while.. i have been diagnosed with Absence (petit mal) seizures.. no one can be really aware of them well these types of seizures.
what happens is the person may appear to be involved with the environment and briefly stop what they are doing, stare for 5 to 10 seconds, and then continue their activity. No memory of the event exits.

so i dont really know when i am having them.. and others may not even notice them either.. so this may be what she has.
i do have severe migraines also.. a lot really. i get them like at least once a week sometimes once every two weeks (at the least).

i was put on several different meds over the past 9 years and i stoped taking them with out my doctors permission about a year ago, cause the meds that i was on were only making me worse.. cause he uped the dose and i was getting all the sysptems and i didnt like them.. and i thought i dont even think i need these cause i am not even really seeing myself having these seizures .. so i did so and then i only got worse and had more and more migraines .. so i got back on the meds and i am doing great ..
so what i think is that maybe she is on too high of a dose of meds, so maybe she should talk to her doctor about the proper dose that is right for her and just see what happends from there.. cause you do not want to stop any meds .. that is the worst thing you can do while having epilepsy.

hope this helps
have a nice day!