Programming classes for a 13yr old

My sister's middle school doesn't offer any code classes (frustrating). I think in this day and age students should have some sort of in-school option to learn the fundamentals of coding. Most people don't need to be a real coder, but even today I feel a bit naked with no real engineering know-how.

Can you suggest classes/courses or games that might be interesting for a middle school girl? As the big bro, I'm happy to do them with her.

Keep in mind that coding isn't perceived as "cool" by most younger girls. With this in mind, I'm also open to suggestions on the best way to approach her with this topic and encourage her to give it a good try.