Board Thread:Questions and Answers/@comment-4528975-20160207015723/@comment-30536711-20160506174737

Uskok wrote: They just need to change her backstory (make her a clone of some Inhuman with titanium claws, created in one of Strucker's experiments) and that's it. And she first appeared in a TV series owned by Marvel, not by Fox.

If it were easy as that than Marvel wouldn't have had to reach a deal with Sony to include Spider-Man in Civil War or the MCU on a whole, they could have just added him because he was an Avenger in the comics, as well as Beast, Wolverine, and the Fantastic Four since they were Avengers at one point as well (or now that Ben Grimm is part of GotG). If they were to go by that logic and add X-23, Marvel Studios could be face a court battle for breaching their contract with Fox as shown in this article:

http://moviepilot.com/posts/2356058

And even though they've reached a deal with Sony to use Spider-Man in the MCU, Sony still calls the shots on how Spider-Man can be portrayed or depicted in the MCU:

http://geektyrant.com/news/marvel-and-sonys-mandatory-character-traits-for-spider-man-revealed.