Fascinating indeed. My own guess — (I guess we’re all guessing) — is that Gertrude, a political naïf capable of only rough calculation re: nuance in current (’39, ’40, ’41 etc) winds of doctrine, and with very genuine affection for Fay — a very affable gentleman indeed, (if you remember our brief meeting with him in Paris), and his returned affection for her, his persuasion to do a friend a favor and say nice things — stretching conscience no more than her willingness would permit — to help his dear friend by translating speeches that might show him in his best light for Americans (faced with defeat and Nazi military invasion, Petain was, after all, saying nice things to shore up his nation’s continuing pride in itself even in a time of terrible adversity), and not until the reality of the Occupation, the deportations, the clouds of war, and its meaning for her, given her lifelong American at-one-ness did she lose enthusiasm and feel distaste for the task and took occasion to let the obligation sort of fade away.