Are you rotating flash drives and such? I would worry about something happening to me, then she goes to use the flash drive, and the data is corrupt or the drive is fried.

This. It is true science how to preserve data long-term. And if you want to encrypt it (e2e or not), you better have very good plan how to recover it when you die

Nope. I recognize it's a risk, but it still seems like the solution with the least compromises and the highest probability of success.

My server sends me notifications for every update with the rsync output so I'll know if any problems arise while I'm around. The last drive in this position lasted 4 years without incident, and I only replaced it earlier this year because it was full.