I’m really surprised I haven’t seen them mentioned here (and apologies if someone did suggest it and I missed it!).
The Monkey Island games. Super simple controls, as most of it is point and click. Not expensive to get into, so no big loss if it ends up not being her thing. They are silly and clever, and reward the player for being silly and clever. They are puzzle games that require some attention to detail and curiosity to solve, but there isn’t any “fail” condition. You just don’t progress if you can’t solve the puzzle. It doesn’t assume any prior game knowledge or habits; a lot of games will expect the player to be familiar with certain controls or tropes commonly used in games, but Monkey Island is more similar to a “choose your own adventure” style story.