I wonder whether her relationship is in trouble. If you check out her Instagram
https://www.instagram.com/carinaaxelssonwriter, you can see that earlier in the year she bought a new cottage in Dorset. She has spent a lot of time there with her dogs and even seems to be spending Christmas at the cottage. I guess she has projects going on that may require a lot of time in London, but still. Would you not expect her to spend Christmas at Schloss Berleburg? What a place to spend Christmas...
IIRC, she's been in DK in recent months. She had a picture of the changing of the guard at Amalienborg.

. I couldn't tell you the last time I saw a picture of her with Gustav, though.