I'm almost sure this was pre-Internet and paper. Asking Google is useless, I only get general pages about German "war brides". I'm trying to ask ChatGPT but right now it seems to hang while loading. I thought about asking DeepSeek, but I don't want to create a login (the ChatGPT site does not require one).

EDIT: ChatGPT actually loaded. I used the first paragraph of my comment as query. It did not give me a specific story, but it claims it "knows" about the phenomenon of German war brides forgetting much of their German, when they did not use it much after moving. Too bad I can't tell what the sources are for that information, ChatGPT saying something isn't proof.