Sacred Haven of Debauchery

I met her at work.

That makes sense; I wouldn't have thought so either. If I had met one (a specific) of my former classmates outside of school (back when I was still in school), I wouldn't have thought she was a schoolgirl. But in our case, there is practically no information.

Let's start with the fact that childhood doesn't necessarily have to be indicated by any clothing.

like a card from the game.

I understand that this is a reworked card, not an official one. You couldn't have imagined what you were writing about. And I couldn't have imagined that the game developers could have drawn such a card for their game, which is why I immediately considered it someone's fantasy. Considering that there are different people and fantasies in the world (I've even seen drawings of the Simpsons that I would like to unsee), I came to a specific conclusion. Moreover, in my opinion, the face/etc. matches the age I wrote about, because, in my opinion, most people look like that.