Avoiding replying to each post here individually, so my feedbackses:
Subnautica and Outer Worlds: I loved Subnautica; magical game. The Outer Worlds was also amazing. But, she watched me play both plenty of times and didn’t express any interest in playing. I still might try to steer her towards either/both of them.
GTA V: I’ve never played any GTA games. Are they Playstation exclusive?
Portal/2: Good suggestion as well. It’ll be on the list.
Stardew Valley et. al.: Neither of us have ever played anything quite like that. I do love a chill relaxing game as well, though (Looking at you, Farming Simulator 19 and American Struck Simulator) so those will be on the experiment list.
LOTR-O: That’s curious…how does turn-based combat work in an MMORPG? Interesting, and seems like it might be up her alley.
Vampire Survivors: I’ve been following that thread! I have the game, but haven’t tried it yet. It may or may not be what we’re looking for…seems kind of intense.
Mass Effect: A couple of mention of this game. Also haven’t played it, will look in to it.
HADES!: OMG U GUYS. I think you might have nailed it there. I have it and have played it for a while. That you actually never “die”, combined with the mythological background and story…that might be our ticket right there. A very fun game with lots of different play styles to try.I was scrolling through all my games trying to find something and for some reason that didn’t jump out at me. Good call, I’m showing that to her tonight.
Horizon: Aw, that looks awesome but we’re on PC 
Haha! BL2 and 3: We played through BL, 2, and the Pre-Sequel multiple times together (including DLC). Assault on Dragon Keep was one of our favorites. We got BL3, but for some reason that I can’t put my finger on it didn’t stick. We were really looking forward to it, though. Tiny Tina’s Wonderlands looks very cool, I’m sure I’ll get it when it’s on sale and we’ll see then.
City of Heroes: That is something entirely different from what I/we ever play. But I like the idea, definitely on the list.