The news that Fox is making a Kitty Pryde solo movie has seemingly come out of nowhere, but the character's long comic history is actually packed full of stories that would be perfect for the big screen. What's more intriguing about the in-development film, however, is that Fox is choosing to move forward with yet another X-Men spinoff in the midst of their pending sale to Disney. As such, it seems increasingly likely that any Kitty Pryde film would have to come out under the new owners, possibly bringing the mutant into the main Marvel continuity. And if that's the case, then Guardians of the Galaxy Vol. 3 would be the perfect way to introduce Kitty Pryde to the MCU.
Created by Chris Claremont and John Byrne for 1980's Uncanny X-Men #129, Kitty (known alternately as Shadowcat, Ariel, and Sprite) has the ability to phase through objects and disrupt machinery, which has proven incredible useful to her fellow mutants in the comics and throughout various television and film appearances. She's most notably factored into X-Men: The Last Stand and Days of Future Past as played by Ellen Page, though it's unclear if the solo film will bring back the actor.
The more likely case is that Disney's buyout of Fox will reboot the character and any film featuring the Kitty would involve a new actor. And given that there's no way for a Kitty Pryde movie to move forward before the X-Men fall under Kevin Feige's purview, the best way to introduce the mutant to the MCU could be as part of one of her more recent comic arcs.
Kitty Pryde In Space
Kitty Pryde actually has quite a lengthy history in space. Not long after her debut, Uncanny X-Men #166 found Kitty and the other X-Men in space. It was during this very mission that Kitty encountered an alien creature that resembled a small, purple dragon. Calling him Lockheed, the two would be inseparable for years and the alien-dragon would be a constant reminded of Kitty's first trip to the cosmos.
Many, many years after her initial intergalactic outing, Kitty began working with the time-displaced original X-Men. While that's a long story in and of itself, the plot eventually brought the wrath of the Shi'ar Empire down on the young Jean Grey who the intergalactic race wanted to put on trial for her older self's actions as the Dark Phoenix. The specifics would of course need to be changed, but the end result is that Kitty headed up to space with her students and encountered the Guardians. And when the trial was all said and done, she decided to stay behind and pursue a relationship with Star-Lord.