@sg325
I can relate with moods affecting the entire family . My 15 year old son has ADHD, anxiety, OCD, etc. and his moods are intense at times and very stressful to me. He takes medication for ADHD and one of them helps to manage the intensities of his moods (guanfacine).

I’m sure hormone changes may have a role to play for your daughter and my son. I have a counselor for my son. Do you have one for your daughter? Have you considered working with a psychiatrist for antidepressants/antipsychotic medications that work for teens with epilepsy?

You may also want to check with a nutritionist/dietitian to see if any changes would be helpful that can reduce symptoms/triggers (foods/supplements, etc.). Do you know if your daughter is allergic to anything that could be a trigger for her? If so, you may want to consider testing.
https://www.epilepsy.com/complications-risks/moods-behavior