Here's a list of links for information/support groups. She'd probably feel better if she could talk with other people with epilepsy, whether on line or in real life. Ask at the hospital if there's a support group. Try doing a google search for [name of country] epilepsy support.

Opinion follows
Personally, I have NEVER understood the shame factor. It's not a mental illness, it's not something the person who suffers from it can do anything about. A 'mild case' should be a small thing, but for the reactions of others and the fear of others' reactions. These may be helped if she explains the nature of epilepsy to people closest to her. The stigma is perpetuated because people don't talk about it. She may not be up to that right now, and it may take a while for her to believe she doesn't have a 'mental illness'.

Right now, the shock of the diagnosis is the problem, not the epilepsy. Probably the best thing for her now is your support, and it sounds like she certainly has that.