The prices of previous great PS5 games are dropping, so you'll have a lot to choose from at way below regular price. The Last of Us Remake will probably be $20 by the time you're done with Hogwarts. The Uncharted collection remake too. I think it's a good time to hop onto a next gen system

it'll grow on you haha, the game is cute af

Animal crossing is single player. And I think you can only have one island per game.

100% recommend Yoshi's Crafted World would be a hit and it has 2player mode. It also has a mellow mode that helps the player if they need it. Get it!
Trailer

But Mario maker for girls age 5 is probably a bit too much complexity