I mean... besides the "waaah waaah nooo fuck Ark, it's a bad game and I don't want it to be a long arc" whining that many people here do (and end up being more annoying than Ark itself), it wouldn't be the worst thing in the world to see Kiara checking it out for one stream or so, she already said that she prefers the exploration aspect of Minecraft over the building autism, so she can have some fun little adventures there. Again, it's not ever going to be a big regular thing in EN, the social fabric is just not there, like Kiara said (without a group playing it for longer, you can rest easy that it's just gonna be one or two streams).
Undertale would also be pretty cool. Obnoxious fanbase aside, the game itself is just a cute little meta rpg, and it would be cool to see her reactions to key scenes, it's sufficiently easy enough (yes I know some G-route fights need tenacity, but she probably won't even get to that route, and hey if she does she should be motivated enough to persevere) and short that she could get it done in 2-3 streams instead of another 20-40 hr jrpg.
I was more surprised she hasn't played it already, because sometimes it feels every girl on the internet in the last 7 years or so has done so, but then of course you remember her muh grafix autism and that it has no cute anime girls so it's immediatly ewww for her without much further thought. I'd hope Flare can maybe get through to her and get over it, if that kind of tangential reason of her recommending it helps.