Frontal lobe seizures out of no where, We dont understand

Long story short, My adult 24F step daughter is on the autism spectrum. She lives with my wife and I full time. She has the mindset as a child most times. about 4 years ago she had her 1st seizure. then 6 months later, her second. It went on like that until last year when she had a massive seizure where she was turning blue. She was in icu for a week, and has had many tests done. she is on medicine called brivaracetam for the last 4 years. just in the last 3 weeks she is having them either every other day or every 3rd day. Last week they informed us she has frontal lobe seizures and have added lamictal to her meds. we also have a inhailer called nayzilam if seizures last longer then 5 minutes. Does anyone have some insight on why all of a sudden they are getting more frequent? Thank you for your time... these things terrify me!!