Elder Scrolls (Morrowind, Oblivion, Skyrim) and Soulsborne (Demons Souls, Dark Souls, Bloodborne, Elden Ring) games both have lots of mysterious lore and fantasy elements. Maybe the lore videos would help her appreciate the art? Lore videos could also pique her interest in a video game without her actually having to play it, which could be a gateway to eventually getting a contoller into her hands.
> literature, ... poetry
Charred Thermos put together a well-researched theory explaining the lore of Bloodborne is based on history, poetry, and literature from Victorian-era Edinburgh in Scotland. Bloodborne has feminine (child birth, menstration). I'd caution against it if she's squeamish because it is a bloody (good) game.
https://www.youtube.com/watch?v=SkNVKkYpgVU&list=PLon6Mvsc0M...
Elden Ring in particular has tons of lore and this is partly due to George R. R. Matin, author of Game of Thrones, working with Fromsoftware to develop the lore foundations of the game. To get an idea of this, here's VattyVidya 13 hour playlist of quality lore videos on Elden Ring:
https://www.youtube.com/watch?v=DYDs_Inzkz4&list=PLWLedd0Zw3...
Additionally, I can recommend what is possibly the most in-depth lore/mystery videos about Elden Ring, by Tarnished Archaeologist:
https://www.youtube.com/playlist?list=PLrxAMoEujZss9Vez20A3b...
Elder Scrolls games, particularly Skyrim, also have significant lore and mysteries she may enjoy. It's much easier to digest than Soulsborne lore. See these examples by EpicNate315:
https://www.youtube.com/watch?v=ibf642CCf20
https://www.youtube.com/watch?v=3KzooXHOyRg
https://www.youtube.com/watch?v=baQfeYJJkWY
https://www.youtube.com/watch?v=gya8eIorwN8
If she's very new to games and wants something aesthetically pleasing, then the best experience might be exploring the wilderness of Skyrim while following interesting quests. Oblivion is an older game that also does this well on a smaller scale. Morrowind feels quite old and may not be her cup of tea, but some players like that the exploration is much more self-directed.
The Soulsborne games are all relatively hard but rewarding in their own way. For anyone who likes mysteries, they'll appreciate that all Soulsborne games do not directly explain the lore very much, and it's up to the player to figure things out. Demons Souls and Dark Souls are great, but lore-wise, Elden Ring and Bloodborne are the best. Bloodborne is shorter and self-contained, while Elden Ring has many questlines that a player can choose to follow. Following the questlines of NPCs is a rewarding experience.
Personally I wish I could convince my fiancee to play some video games because I imagine it would be valuable to share the same meaningful experiences that come with great moments in games. Her reasons aren't that the games lack artistry, but the games themselves are too scary for her. I just have to accept she has different tasts and hope maybe one day a non-scary / violent video game will be interesting to us both.