Quote Originally Posted by Force de Phenix View Post
She's only like 10 years old, so she could have developed an X-Gene in a future story, but she's practically dead in the comics world. It's funny how in the 90's she had an event and Crystal was a member of the main Avengers team, and now she'll only be making a cameo in one Fantastic Four issue.
I'd have to double check the issue, but you can test for the X-Gene prior to manifestation of abilities.