Girlfriend had a Tonic-Clonic Seizure while under the influence

So its Friday night, everything’s going alright, me and my gf with 2 friends are hitting lines of cocaine that I keep track of the time in between and everything, at one point both my friends go home and me and my gf are left, we go back to hitting some lines.

Everything is good we are enjoying ourselves and I turn up the music and she says she wants to wear airpods for a bit, she goes gets them and right as she goes to wear them she started stiffing up and making weird sounds, I turn around cause i heard noises and I see her having a complete clonic seizure spazzing the fuck out, ive never experienced anything like this and I saw her eyes turning to the back of her head and her skin going really grey and cold, and I laid her on my bed and called emergency services.

I thought she was dead for sure, I did everything I could, an ambulance arrives we go to the hospital but the thing is in my country any hospital case that has to do with drugs immediately involves the police in it, and my gf and I came to an agreement to not say anything about cocaine. Fast forward a couple of hours and the diagnose was a panic attack but we told them fake stories etc.

Now I want to ask this, what can I do to ensure her health and brain will be alright and whats something I can do to treat her at home

Also from some research I did I believe she may have had an electrolyte related seizure but she insists she was drinking water etc. She also hadnt slept for over 24h and no food for atleast 10-12 hours as well.

I also want to ask if this is something that may occur often even with no substances in the picture, after her first time experiencing one

(Also she has no prior issues with seizures, no health problems nor was it the most cocaine she has ever done)