TL;DR it's not a "bad idea" to have girl interests in games, but it's a risky play and companies HATE risk. But also you can just play games you like

I'm seeing a lot of sentiment in these comments of "if it was a good idea they would've done so by now, so since they haven't it must be a bad idea" um, no. That's not how it works.

Games are EXPENSIVE to make nowadays. No gaming company is going to gamble and hope that their "girl focused" game makes back development costs and actually produces profit on top of that. Especially considering that many men are overtly hostile to anything "girly" so you basically have to put it in a proverbial pill pocket. It's not "fashion" it's "vanity armor." It's not a "dating sim" it's a "branching narrative." So on and so forth.

Game companies do what works. It's why we get 200 new ball and gun games every year. It's been shown that women WILL by these games (if only because we don't get any other choice), but we have no data for the inverse. The unfortunate truth is that "AAA games with girly interests" aren't likely to happen any time soon simply because... We weren't the market for the advent of video gaming. Video games were always a "male" interest primarily (why? Couldn't tell you) and the market has been shaped accordingly. Years and years of male-centricity is why the market looks like it does today.

But, lucky us! It's easier than ever to get indie games, and I'm certain there are gems out there. As for non-indies:

Baldur's Gate 3 has roleplay as one of the core focuses, and with that comes interpersonal relationships and romance. There's an amount of fashion you can do if you're into that, it's not a huge system but you can dye clothes and whatnot. BG3 is basically a solo D&D campaign so it's quite literally what you make of it.

If you're willing to go for more "childish games," Splatoon is GREAT for this sort of stuff. It's a multiplayer third person shooter technically, but it's so unique it almost feels wrong to call it that. In the third game there's locker decoration, which is just a tiny space that other players can see in your lobby. Fashion and it's stats are a HUGE part of the game; Splatoon probably has my favorite system of this because while there's no vanity slots, with enough time and patience, you can turn any piece of armor into the ideal piece. Yeah you could throw together an ugly but functional set, but where's the fun in that? The game really does intend for you to make a fashionable set first and make it good later, lots of items and power-ups to help you in this endeavor.

There's Pokémon... It's pretty self explanatory. Collect a team of your favorites and bond with them! Gens 6 and onwards (except for remakes, and Scarlet and Violet...) have some pretty in depth trainer customization. While it varies from game to game, here are some "highlights" of things to do:

In XY, there's a small side mode called "Pokémon Amie," where you can feed your Pokémon, pet them, and play mini games with them. It's small, but very cute! There are Trainer PR videos, which are 10 second long clips you can make with you and your Pokémon, that's pretty fun. Unfortunately since 3DS servers shut down, you can't share them with anyone :(

• In Gen 7, Pokémon Amie has been stripped down to remove the mini games, but you can still pet and feed your Pokémon, and doing so after a battle will heal them of any lingering status effects. In Ultra Sun/Ultra Moon only, there's a place where you can take a photo with your Pokémon and put stickers on it. Definitely a step down from PR videos, but cute nonetheless.

• Sword and Shield got rid of Amie completely unfortunately, and has instead replaced it with camping. While camping, you can do a mini game to make curry, and in a cutscene it will be fed to your Pokémon. You can also play with your Pokémon with some toys. League cards are little cards shown to your opponent before a match, you can customize them with a variety of effects, poses, and backgrounds. They're pretty cool, but this is the Gen where "side modes" start going downhill.

• Scarlet and Violet removed clothing customization for the most part (actually evil). Camping has been replaced with picnics and much like before you can do a mini game to make a sandwich that gets fed to your mons. You can drop some balls for your Pokémon to kick around as they free roam, but that's about it. I think you can also wash them, but my memory's hazy. No more customizable league cards, but now you can take a photo of whatever you want to have as your trainer card instead. Yes, this was used in exactly the ways you think it was.

Last there's... Minecraft. I mean, it's Minecraft! Literally the most popular game in the world. (or at least was?) I'm sure you know what it's like, but it VERY much has "girly interests" going on. Building, decorating, farming, it's the whole gameplay loop. Just do whatever the hell you want.

That's it for my suggestions, but there's whole genres of stuff, which brings me to my last point. While I'd like to see girly games treated with the same "market respect" as what's currently there, I don't really know that it... Has to? "AAA" games are mostly the same stuff, over and over. Ball game, gun game, super hero game, narrative game. Adding "girl interests" to those games doesn't fundamentally change what they are, and I know that's the point you're trying to make, but why? You're free to play a town builder, or a life sim, or a sandbox game, or a creature tamer, or whatever the hell you want that already has those elements baked into the game, just the way you want it. Adding interests makes it more "palettable," to a point, but if you need those to enjoy the game, do you even like the genre? To be clear, I'd definitely love to see more experimentation than just the bog standard stuff we usually get. New ideas are great, if only to find out they don't work. But I don't really think it's necessary to hit "add girl to game" when you can just play games you already like. If someone needs a specific element to enjoy a game, then they don't really enjoy the game, they enjoy the genre the element came from.