A few suggestions, not sure if they are maybe a bit too twitchy for her or not her style, bit hard to judge.
Child of Light - epic little platformer, not too demanding and very good story. One of the few games in the past decade which really hooked me in, for a 12 year old girl it should be a perfect fit
The Anno series is one of my go-tos for slow paced rts gameplay, I spent tons of times in them. Typical german game style, tons of micro management without the need for it (one can ignore it, unless you build really big cities). My suggestion would be either Anno 1404 for medieval time or Anno 2070 for future time line. My favourite was Anno 1701, but thats much older, still beautiful game with lots of depth, Anno 1404 was a bit too simple for my taste, makes it a good entry title. Anno 2070 was bit more polished with more focus on using RPG elements (single unit use in the campaign) to spice up the gameplay. If she likes city builders I would get 1404, if she likes RPGs AND City Builders, its Anno 2070.
Other, similar, options would be Cities: Skylines as a modern time city manager or Planet Coaster as a theme park manager. Both very good, time consuming, easy entry but can get more complicated if you handle larger cities/parks.
I love playing Kleis Oxygen not included recently, very good physcis based space conlony simulator. Bit brutal though on the difficulty, one tiny mistake and everything goes to shit. Steep learning curve.
Hob - adventure game, very minimalistic and a bit short. Not very demanding but solid gameplay.
Pyre - I fear this might be too twitchy for her, still I loved the characters in this gameand I’m only around half way done (finished it twice till now). The gameplay is a mixture ofsome sort of ball game and a RPG. I loved it
Bastion or Transistor - both action RPG with lovely story, they are not overly demanding when it comes to control, but its hard to judge for me. Still, bastion is one of the most renowned games in this genre over the past decade with outstanding story telling. They are also dirt cheap to pick up . Transistor features some sort of ‘turn based’ mode, Bastion was abit more hands on if I remember right. I love Super Giant games, I might be a bit biased
I know Okami was released on Steam now, it doesn’t seem too twitchy and pretty story driven, maybe that would be a game she likes? One of the most popular PS games ever!
If you need more suggestions, I have more, but some sort of direction would be nice, like genre for example .