@robot_ditto remember that Coffee only affects the Living Doll (Barbie) and the shadows (Barbara) would only be merely affected by their living dolls, never getting directly brainwashed.
that being said, I think it's probably because Barbara's main purpose is to just "Be like Christopher" and "Become an Adult". She should already know about "unification takes away the living doll etc." when talking with Sir Thomas there, but all for the sake of finally meeting Christopher / Making him Proud / Carrying on his will by aiming to become an adult.
all the while not knowing Christopher already died... it's sad but that's how it is.
also
@phantommemorial it's definitely getting an Anime adaptation starting to air on April. just some news I heard a while ago. but seeing how it's "kinda small" right now, I'm guessing, at best, the Anime will probably be a one-season-12-ep. sort of thing and end right on the Debut's End on chapter 40-something when Kate reaches the end. just my dumb guess though. If they adapt "more" chapters in 12 EP that would basically be cutting a lot of content / rushing it too much that I wouldn't even find it enjoyable, i think. but anything less would be anticlimactic.