Just curious...did you automatically put her on concerta when she was diagnosed with ADD/ADHD? I have some parents that choose not to medicate...and it's because they worry abuot drug interactions or side effects. Many times, they go with the old special ed. trick...which is to give the student a half a cup to a whole cup of coffee, to see if it helps. For many, it does. It helps the student to focus with fewer possible interactions and side effects. If you're going to try this, make sure that you don't let your child use sugar in the coffee. Only coffee, creamer, and splenda. (Aritifical sweeteners, like in diet sodas, can cause seizures. ) You'll also want to note whether your daughter has any food allergies. Food allergies can be a trigger too. As can the artificial preservatives, flavorings, and colorings added to food. I know...sounds like there's triggers everywhere....the best bet, for diet if you don't want to go organic, is to shop around the edges of the grocery store as much as possible. All the stuff in the aisles is pretty much chemical city. HEre's some steps you might want to take:
1. Have her eat 6 small meals a day. ( By small, I mean a meal should fit on the salad plate. this will keep her blood sugar levels stabilized. And low blood sugar can trigger seizures. It's weird but you'll find a higher rate of hypoglycemia and diabetes in people with epilepsy then in the general population. So the best thing you can do is try to switch your family to a diabetic style diet.)
2. Have her get 7-10 hours of sleep each night. (Teens need more sleep than an adult due to growing occuring while we sleep.)
3. Have her find healthy ways to deal with stress. (Exercise (battles the weight gain that happens with many seizure meds), art, writing, yoga, meditation, prayer, gardening. All of these are good possibilities.)
4. Cut out ALL caffeine. (Caffeine triggers seizures. It's a stimulant. so this will include all sodas, coffee, tea, mate, and energy drinks...)
5. Keep away from diet sodas or food....(loaded with chemicals, many of which can trigger seizures)
6. Stay away from fast food (loaded with chemicals. Plus they actually put sugar in burgers...a stimulant...the last thing we need.)
7. Quit taking OTC meds for colds and allergies. (Especially antihistamines. Antihistamines are a stimulant. And other meds like Nyquil can trigger seizures.)
I know...it sounds like there's lots of triggers...and there are....but if you can find what her triggers are, it should help. If you can't, and some people never do, then you may have to look into different meds or the addition of a med. If you choose to take her off the meds, then make sure you do it under a doctor's supervision, and that you have other treatments that your using while the weaning process takes place. My suggestions would be EEG Neurofeedback (great results for people with ADD/ADHD, and some insurances even cover it...) and vitamin supplementation (before you start this, have a COMPLETE blood workup done first.
Right now, your daughter is going through depression. Let's face it, it's hard being a teen. And then adding to that a medical condition that is brutally obvious is no picnic. You may want to consider getting her a service dog. The service dog may actually help her to make friends. After all, what kid isn't at least a little curious about service dogs.

I think there's a service dog group in Temecula, CA that offers service dogs free of charge to people who qualify. If you're going to consider this, just remember that there are 2 different kinds of seizure dogs. One is an alert dog, they are dogs that alert the person before a seizure happens (you cannot train for this ability. Some dogs alert and some don't.) and seizure response dogs. (These are the ones that are trained to roll the person on their side, and get help, or stay with the person while they are seizing. )
Good luck!
Oh! Have you considered getting her involved in community or faith based groups for teens? Maybe at a rec center or church? That way she would have other kids that she cuold socialize with. If you haven't you might want to contact different groups in your area, and explain your daughters situation. Your daughter has to stop thinking that seizures are the end of her world. Many of us go on and get educations (and I'm talking grad degrees...), careers, and families that love us...( And no, we don't end up old maids.

I have a wonderful husband. And yes, I have grand mals.

)