if ever this happen to me, I already told this to my girlfriend. Though, its too difficult for her to understand what I did here in cypto, at least little by little I'm trying to explain this to her until she understand what all this in the future. From how to trade, in the platform, to withdraw it from the wallet, and deposit it going to fiat something like that.
Why explain it to her if she does not understand it well? Just leave a will, and instructions on how to download a wallet client, and restore the seed, and she has your bitcoin. Or leave instruction to lawyer to liquidate bitcoin when you die.
Do not leave it to people to understand. Leave them exact instructions step by step.