What did Betsey call it? Doing a “Bob Barker”? There’s hardly a better façade in the world than a genuine bright, unflagging cheerfulness. It sucks at aggression and resentment like a vaccum cleaner.
She won’t be able to push your buttons because you HAVE NO BUTTONS! You’re a wonderful, secure, happy wife supporting her dear husband in times of strife. You’re secure because having you, no man would even THINK to look elsewhere, and you know it.
Go, and look fabulous, and enjoy yourself as much as possible under the circumstances.