I would highly recommend not starting with phone games. 90% of them are designed to be addicting, borderline gambling games, which you can collect or accomplish more things if you just pay them an easy $2 or more... which quickly turns into $20, which then becomes $50+. Before you know it, you're throwing hundreds of dollars at what is essentially a repetitive unending game, just for the dopamine hit.

I know; my wife is addicted to these games and I see $20 charges to our bank account every few days. Nothing ever changes in her games. She never progresses anywhere and there's no end to the game, but it gives her a boost on scores or collectibles or rare limited items, so she drops the money. It's been especially hard to break her of the habit.

I got her to sign up for Steam on her desktop PC and I gifted her a few co-op games, and so we play games online together to give her something fun to do that doesn't require spending money to progress. She used to be awful at FPS games, but playing with me gave her more confidence and practice, and now she's pretty decent.

She really loves Deep Rock Galactic, because a lot of the game is just mining and resource-collecting, with only a little alien bug shooting. She plays as the engineer, so she can set up a turret and not have to worry too much about aiming herself. Plus, playing solo means she gets Bosco, the flying droid, to help her with combat and resource-collecting too. If I'm not around to play with her, she has all the assistance she needs to relax and enjoy the game. It was a very good intro to video games for her.