Bree Larson doesn't get to pick or choose. She's an actress, and she's contractually obligated to do appearances, media sessions, and promotional events. Her scheduling is handled by Disney's PR company and dictated to Larson. The media venue gets to choose its representative, or you'd be reading everywhere Disney is now making demands about who can be sent to interview its stars. Larson can stew about the makeup of her interviewers, but when Disney says you sit for Vanity Fair, say, you don't get to whinge when the person who shows up for the media day or press junket or private interview is the race or gender you don't like.
It's good Larsen wants to be inclusive. But I can't imagine anyone would look favorably on her if she sits down for an interview and asks if a more diverse writer can tell her story.