What can we do for friends and loved ones drawn in by reactionary conspiracy theories?

Someone I am very close to has become increasingly isolated. She doesn't want to do anything except watch "documentaries" like this one: https://www.youtube.com/watch?v=KfzupXBlrIU She doesn't want to socialize, because "no one understands what's really going on." She mentioned recently that she has a Telegram account, so I'm...