^she's been a New Warrior and an Avenger, so ... complicated.
Her comic debut was in Uncanny X-Men and she was on the Hellions with Emma Frost as an adversarial group to The New Mutants IIRC.
I want to say that she had some guest appearances in some of the X-Books as it looked like her microwave powers had given her cancer. It was thought she was going to die, then didn't. I don't recall how. I want to say this was around the Utopia storylines? Now she's in the Allies
book which I've not been keeping up with.
So, yeah is she then as a mutant under Fox's contract or as an Avenger is she fair game with Marvel Studios or do the ties to animated Spidey legit as an expanded supporting character?