It seems like it was just a one off. There doesn't seem to be anything clearly wrong neurologically, and my blood sugar was incredibly low at the time. I'm also apparently predisposed to getting seizures at low blood sugar from a condition I have, I was on a medicine at the time which lowered my seizure threshold, and I think another medicine was artificially lowering my blood sugar too. So it was just the perfect storm.

I hope things turn around for your sister :/. That's absolutely awful. I'm incredibly fortunate, but for a while it was possible that could've been me. I hope there's a miracle cure out there to help.