I found this greeting card in a secondhand copy of the book Poirot Loses a Client. I wonder if these ladies stayed friends.
The translator I used is probably not accurate, and the handwriting’s quite hard to read, so this is the best translation I could piece out (it’s written in Danish):
I’m (???) currently and have been for the last 14 days. They have probably so busy at home or working, and so waiting is better than to go for control. I hope to get a fairly full strength painting team at school again in January. I wish you a merry Christmas.