Anyone know about Louisette Bertholle?

The third author of “Mastering the Art of French Cooking” has never been written about as much as Julia or Simcha, and no online source that I know of has either an obit or confirmation that she’s still alive–she’d likely be a centenarian. She might have fallen off the media radar if she later remarried and changed her name. Do any Dopers know more?

I know from Julia Child’s My Life in France (what a truly wonderful book, by the way) that Louisette’s second marriage was to Comte Henri de Nalèche, but I was no more successful than you at poking around the internet for more info.