It's so important to me that Minkowski and Eiffel and Hera spend December 25th together to celebrate Eiffel's birthday post-canon. And the hope that they spend that day together is a sentiment shared by Gabriel Urbina.
But Minkowski canonically cares about Christmas itself. Minkowski has people in her life whom she could spend Christmas with. And so there will probably have to be a difficult conversation at some point after the Hephaestus crew return to Earth, when someone says how good it will be to have Renée there for Christmas Day again. And Minkowski will have to look at her husband, or her relatives, or her in-laws - people who loved her and mourned her and celebrated upon her return from the dead - and she'll have to tell them that she won't be there on Christmas Day. And if the person who asks knows her at all, they'll see the look on her face and know that there's no negotiating to be done here.
It's not exactly that she doesn't want to celebrate Christmas with the people she used to celebrate Christmas with. But she can do that on any day near the end of December. Spending December 25th with Eiffel and Hera is something she absolutely cannot compromise on.
The main reason she'd give for this is that December 25th is Eiffel's birthday. Whether or not it matters to him as much as it used to, Minkowski wants Eiffel's birthday to get the recognition it deserves, because it was so important to him and he never expected anyone else to care or remember.
A second reason - one she might never speak aloud - is that she's always thought that Christmas is a time for family, and nowadays that means that spending it with Eiffel and Hera feels right to her.
But I think there's a third, perhaps equally important, reason underneath those two. Maybe she doesn't admit it to herself consciously, but I think part of Minkowski believes that the only people who can really understand the complicated way she now feels about December 25th are the two people who were there with her when everything went to hell on Christmas Day.
It was December 25th when they realised they'd made contact with aliens, and when Hilbert locked Minkowski outside the airlock and tried to incapacitate Eiffel and tore out Hera's personality hardware, and when everything Minkowski had thought she knew about the Hephaestus mission fell apart.
How can she exchange gifts with people for whom it isn't the anniversary of the one of the worst days of their life? How can she gather round a Christmas tree with people who've never feared for their lives at the hands of Alexander Hilbert and Goddard Futuristics? How can she eat turkey and trimmings with people who weren't there when the Christmas dinner was never eaten because there was a murderous mutiny from one of the intended guests? How can she spend December 25th with people for whom it's never been a day of betrayal and fear and loss and uncertainty eight lightyears away from Earth?
Eiffel doesn't remember that awful Christmas and that brings its own kind of pain for Minkowski. But he was there, and so was Hera, and so (no matter what anyone else expects) Minkowski needs to be with them on that complicated day.
