Severance

100% I disagree with this comment. You are guessing what you think the answers are. You don’t know the purpose of sending her into a room where she exists only to write Christmas thank you cards.

But the subtext explains this! First Gemma says that she hates writing "thank you" cards, then we see a severed version of her being forced to write the cards. The purpose is to force her into a situation she hates.

From this arises the question: why are they doing this to her? The doctor keeps asking her how she felt after each room. The episode also happens to bring up the severed birthing center. This implies that they are testing how strongly her outie version is affected by her innie versions being forced into situations she hates.

Now my second answer is only speculation, but they've set up the other "twists"/reveals in similar ways. But that's also why I'm sure we'll learn more about this in the next episodes.