In person, Mrs. Sánchez Bezos is surprisingly tiny, less lacquered than the glossy images that circulate online. She picked out a window booth, and when the hostess said it was reserved, she smiled. “Oh,” she said. “I want to know who’s sitting there.” She tossed her black Birkin bag, adorned with each of her children’s names and a Flynn the Fly keychain, on another corner table and asked the server his name. (“That’s Luciano,” she said to me. “He’s from Argentina.”) When somebody suddenly turned the music up, Mrs. Sánchez Bezos shimmied and joked: “Want me to dance on the table? That gets a lot of attention.”

You would think that marrying into obscene wealth would transform a person, but in this case, Mrs. Sánchez Bezos appears less changed than her husband; the world has long been her Everything Store. Even before she married Mr. Bezos, whose net worth is estimated to be roughly $250 billion, Mrs. Sánchez Bezos liked to think she was 20 percent happier than the average person. Even when she was 18, crashing in a cousin’s garage in Carson, Calif., after she hadn’t gotten her dream job as a Southwest Airlines flight attendant because she was a few pounds over the weight limit, she was still basically happy.

“If baseline is here,” Mrs. Sánchez Bezos said, holding her hand about chest height, “I’m up here,” with her other hand above her head.

The couple had recently returned from Seattle, where Mr. Bezos celebrated his 62nd birthday by making pancakes for all of their seven children from previous marriages. Mrs. Sánchez Bezos, 56, adores kids. Having them. Raising them. Encouraging other people to have them. Over several interviews, she repeatedly urged me to have another baby. “Do it!” she said. “I would have another one tomorrow. Tomorrow.” I finally asked if she and Mr. Bezos were considering it, as a couple of her friends had suggested to me. “I would have a baby tomorrow,” she repeated, with a coy smile. (A spokeswoman later called to say Mrs. Sánchez Bezos was not having a baby.)

But honestly, why not? Mrs. Sánchez Bezos has shown that with the right attitude and mind-boggling wealth, anything is possible. Space travel. The Met Gala. Fertility after 50.