Yes! Winifred is in this book, although she's not one of the titular "wives."

Hitler charmed some of the "wives" as he did her: by doing things like bringing flowers and gifts, for them or their children, or going to their weddings or Christmas parties. As you say, it's hard to fathom, especially when they knew he could turn on them in a flash, as he did Ilse Hess after Rudolf's weird flight.

Nazi Wives does have fascinating details, including the only account of Hitler's bunker wedding that really made me see everything from Eva's taffeta dress to the food. It's just a little hard to follow because of how it jumps back and forth among the wives.

If you like WWII histories or memoirs, Daniel Finkelstein's Two Roads Home: Hitler, Stalin and The Miraculous Survival of My Family is getting stupendous reviews, and from the few chapters I've read so far, they are deserved. It seems a top candidate for "best books of the year" lists.