1, "rising east and setting west" means that the weather is changeable, and it may rain in the west at the same time of sunrise. This proverb is often used to describe the changeable weather, which means that things don't always go as expected.
"You are a beautiful woman" is an exaggerated and humorous tone, expressing self-confidence and self-mockery. Although the word "your grandfather" is often used by older men to address themselves in Chinese, it is used to express themselves here. "Big Beauty" is a kind of self-assertion, which shows her confidence and humor in an exaggerated way.