User:SOTO/Forum Archive/The Panopticon/@comment-39450671-20200202135812/@comment-39450671-20200202230518
From Tardis Wiki, the free Doctor Who reference
The intent here is not to discuss whether they are or not companions, they certainly are. But in the movie per se she declines the offer to become a companion. But if the point is what User:BananaClownMan said, I understand and agree with the reason.