You’ve gotten plenty of suggestions, but I’ll launch an oddball one out, just in case.

Does your daughter already consume fanfic based on her favorite movies/television? “Young teen” is the prime age to start getting into fanfic on one’s own. I, and my entire friends’ group, were writing/reading up a storm at that age.

If she does like fanfic, maybe offer her the original book form of Ender’s Game. It has several sequels that never got made into movies. Likewise, if you end up watching the Expanse and like it, it started as a book series, and there’s a few books that didn’t get turned into the show.

There’s a LOT of excellent sci-fi out there that’s written that will never get made into movies or television because A) it’s not suitable for a visual medium because it’s too “thinky” or “in your head” which makes it difficult to film or animate, or B) It’s too new/cutting edge/weird for movie/television studios to risk putting lots of money on.

So if she’s already exploring the written medium as an ancillary way to get more content around existing movies/shows, perhaps offer some books in the genre? Most cutting-edge sci-fi shows up in books 10-20 years before it hits movies/television. So if she likes the sci-fi for the “cutting edge cool idea” aspect of it, there’s usually more to chew on on the lit side of things–both in quality and quantity.

Martha Wells’ Murderbot series is very popular, and although the name suggests otherwise, I wouldn’t flinch at giving it to a 12 year old to read. It’s honestly tamer than Ender’s Game (the book at least), where those kids are flat-out murdering/crippling one another in the book. Murderbot, in contrast, doesn’t really like murdering all that much.