Hello Riggs and Welcome to the Epilepsy forum. I am Kitt. You have received some very good advice and I will not try to make any gueses re the CT's/EEG questions.
I think Carla has a valid point as inpatient monitoring may be the answer to picking up what is happening with your daughter.
It does feel like you have done a wondeful job as a Mother getting her the medical care she has needed. I wish for both of you only the best.
Take care and again welcome
A couple of things came to mind as I read your story.
You might also want to think about having a sleep study done on her.
1) It's very common for the tests (EEG,CAT scan, MRI, VEEG etc.) to come back normal. That usually indicates that the "seizure activity" is located DEEP within the brain so most tests will not pick it up.
2) You mentioned in your first post that your daughter's first seizure came at night when she was 15yo. and was totally out of it for about 10 mins.when she woke up. (post ictal state)
Is it possible that she could have some sort of airway obstruction during her sleep? Such as lying on her back, snoring etc. She could have a form of Sleep Apnia causing a lack of oxygen to her brain, combined with starting puberty (hormonal changes)
Here's my case, you might find it interesting as it relates to Sleep Apnea and night seizures.
I was diagnosed about a year ago with Chronic Obstructive Sleep Apnia. After my sleep disorders test the Dr. showed me the EEG from one night, I would stop breathing up to 50 times/hour and had 3 seizures and that I was waking up "post ictal" (moody and spaced out) I have recently purchased a CPAP machine which provides constant air pressure and have noticed a vast improvement. No more snoring (the whole family sleeps better now), more energy when I wake up, better REM sleep, improved memory (less short term memory loss), and most of all ~ NO MORE NIGHT SEIZURES.
Now I definately think it's sleep related.
Lack of oxygen during sleep and wake up in a post ictal state.
Think of it like you're drinking a lot of liquor and you're sitting in one spot ~ you feel fine. then you get up and try to walk.